Double separator when New Tab button is on the left

[menma1234]

Describe the bug

Starting with v108, it seems that if the New Tab button is the first button on the tab bar, there's a double separator between that button and the first tab.

I'm on v6.5.1 of Lepton.

Expected behavior

There should only be one separator between them.

Screenshots

OS

Windows 10

OS - Others

No response

Firefox Version

v108.0

Distribution

• Original Lepton
• Lepton's photon style
• Lepton's proton style

Theme

• Light
• Dark
• Alpenglow (System: Light)
• Alpenglow (System: Dark)
• System Default
• Others: (e.g. Photon Colors, Google Chrome Dark, Fairytale Of Nature)

Theme - More Info

No response

user.js setup

user.js setup

// ** Theme Default Options ****************************************************
// userchrome.css usercontent.css activate
user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);

// Proton Enabled #127 || Removed at 97 #328 (Maintained for compatibility with ESR)
user_pref("browser.proton.enabled", true);

// Proton Tooltip
user_pref("browser.proton.places-tooltip.enabled", false);

// Fill SVG Color
user_pref("svg.context-properties.content.enabled", true);

// CSS Color Mix - 88 Above
user_pref("layout.css.color-mix.enabled", true);

// CSS Blur Filter - 88 Above
user_pref("layout.css.backdrop-filter.enabled", true);

// Restore Compact Mode - 89 Above
user_pref("browser.compactmode.show", true);

// about:home Search Bar - 89 Above
user_pref("browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar", false);

// CSS's `:has()` selector #457 - 103 Above
user_pref("layout.css.has-selector.enabled", true);

// Browser Theme Based Scheme - Will be activate 95 Above
// user_pref("layout.css.prefers-color-scheme.content-override", 3);

// ** Theme Related Options ****************************************************
// == Theme Distribution Settings ==============================================
// The rows that are located continuously must be changed `true`/`false` explicitly because there is a collision.
// https://github.com/black7375/Firefox-UI-Fix/wiki/Options#important
user_pref("userChrome.tab.connect_to_window",          true); // Original, Photon
user_pref("userChrome.tab.color_like_toolbar",         true); // Original, Photon

user_pref("userChrome.tab.lepton_like_padding",       false); // Original
user_pref("userChrome.tab.photon_like_padding",        true); // Photon

user_pref("userChrome.tab.dynamic_separator",         false); // Original, Proton
user_pref("userChrome.tab.static_separator",           true); // Photon
user_pref("userChrome.tab.static_separator.selected_accent", false); // Just option

user_pref("userChrome.tab.newtab_button_like_tab",    false); // Original
user_pref("userChrome.tab.newtab_button_smaller",      true); // Photon
user_pref("userChrome.tab.newtab_button_proton",      false); // Proton

user_pref("userChrome.icon.panel_full",               false); // Original, Proton
user_pref("userChrome.icon.panel_photon",              true); // Photon

// Original Only
user_pref("userChrome.tab.box_shadow",                false);
user_pref("userChrome.tab.bottom_rounded_corner",     false);

// Photon Only
user_pref("userChrome.tab.photon_like_contextline",    true);
user_pref("userChrome.rounding.square_tab",            true);

// == Theme Compatibility Settings =============================================
// user_pref("userChrome.compatibility.accent_color",         true); // Firefox v103 Below
// user_pref("userChrome.compatibility.covered_header_image", true);
// user_pref("userChrome.compatibility.panel_cutoff",         true);
// user_pref("userChrome.compatibility.navbar_top_border",    true);
// user_pref("userChrome.compatibility.dynamic_separator",    true); // Need dynamic_separator

// user_pref("userChrome.compatibility.os.linux_non_native_titlebar_button", true);
// user_pref("userChrome.compatibility.os.windows_maximized", true);

// == Theme Custom Settings ====================================================
// -- User Chrome --------------------------------------------------------------
// user_pref("userChrome.theme.proton_color.dark_blue_accent", true);
// user_pref("userChrome.theme.monospace",                     true);

// user_pref("userChrome.decoration.disable_panel_animate",    true);
// user_pref("userChrome.decoration.disable_sidebar_animate",  true);

// user_pref("userChrome.autohide.tab",                        true);
// user_pref("userChrome.autohide.tab.opacity",                true);
// user_pref("userChrome.autohide.tab.blur",                   true);
// user_pref("userChrome.autohide.tabbar",                     true);
// user_pref("userChrome.autohide.navbar",                     true);
// user_pref("userChrome.autohide.bookmarkbar",                true);
// user_pref("userChrome.autohide.sidebar",                    true);
// user_pref("userChrome.autohide.fill_urlbar",                true);
// user_pref("userChrome.autohide.back_button",                true);
// user_pref("userChrome.autohide.forward_button",             true);
// user_pref("userChrome.autohide.page_action",                true);
// user_pref("userChrome.autohide.toolbar_overlap",            true);
// user_pref("userChrome.autohide.toolbar_overlap.allow_layout_shift", true);

// user_pref("userChrome.hidden.tab_icon",                     true);
// user_pref("userChrome.hidden.tab_icon.always",              true);
// user_pref("userChrome.hidden.tabbar",                       true);
// user_pref("userChrome.hidden.navbar",                       true);
// user_pref("userChrome.hidden.sidebar_header",               true);
// user_pref("userChrome.hidden.sidebar_header.vertical_tab_only", true);
// user_pref("userChrome.hidden.urlbar_iconbox",               true);
// user_pref("userChrome.hidden.bookmarkbar_icon",             true);
// user_pref("userChrome.hidden.bookmarkbar_label",            true);
// user_pref("userChrome.hidden.disabled_menu",                true);

// user_pref("userChrome.centered.tab",                        true);
// user_pref("userChrome.centered.tab.label",                  true);
// user_pref("userChrome.centered.urlbar",                     true);
// user_pref("userChrome.centered.bookmarkbar",                true);

// user_pref("userChrome.rounding.square_button",              true);
// user_pref("userChrome.rounding.square_panel",               true);
// user_pref("userChrome.rounding.square_panelitem",           true);
// user_pref("userChrome.rounding.square_menupopup",           true);
// user_pref("userChrome.rounding.square_menuitem",            true);
// user_pref("userChrome.rounding.square_field",               true);
// user_pref("userChrome.rounding.square_checklabel",          true);

// user_pref("userChrome.padding.first_tab",                   true);
// user_pref("userChrome.padding.first_tab.always",            true);
// user_pref("userChrome.padding.drag_space",                  true);
// user_pref("userChrome.padding.drag_space.maximized",        true);

// user_pref("userChrome.padding.menu_compact",                true);
// user_pref("userChrome.padding.bookmark_menu.compact",       true);
// user_pref("userChrome.padding.urlView_expanding",           true);
// user_pref("userChrome.padding.urlView_result",              true);
// user_pref("userChrome.padding.panel_header",                true);

// user_pref("userChrome.urlView.move_icon_to_left",           true);
// user_pref("userChrome.urlView.go_button_when_typing",       true);
// user_pref("userChrome.urlView.always_show_page_actions",    true);

// user_pref("userChrome.tabbar.as_titlebar",                  true);
// user_pref("userChrome.tabbar.on_bottom",                    true);
// user_pref("userChrome.tabbar.on_bottom.above_bookmark",     true); // Need on_bottom
// user_pref("userChrome.tabbar.on_bottom.menubar_on_top",     true); // Need on_bottom
// user_pref("userChrome.tabbar.on_bottom.hidden_single_tab",  true); // Need on_bottom
// user_pref("userChrome.tabbar.one_liner",                    true);
// user_pref("userChrome.tabbar.one_liner.combine_navbar",     true); // Need one_liner
// user_pref("userChrome.tabbar.one_liner.tabbar_first",       true); // Need one_liner
// user_pref("userChrome.tabbar.one_liner.responsive",         true); // Need one_liner

user_pref("userChrome.tab.always_show_tab_icon",            true);
// user_pref("userChrome.tab.close_button_at_pinned",          true);
// user_pref("userChrome.tab.close_button_at_pinned.always",   true);
// user_pref("userChrome.tab.close_button_at_pinned.background", true);
// user_pref("userChrome.tab.close_button_at_hover.always",    true); // Need close_button_at_hover
// user_pref("userChrome.tab.sound_show_label",                true); // Need remove sound_hide_label

// user_pref("userChrome.panel.remove_strip",                  true);
// user_pref("userChrome.panel.full_width_separator",          true);
// user_pref("userChrome.panel.full_width_padding",            true);

// user_pref("userChrome.sidebar.overlap",                     true);

// user_pref("userChrome.icon.disabled",                       true);
// user_pref("userChrome.icon.account_image_to_right",         true);
// user_pref("userChrome.icon.account_label_to_right",         true);
// user_pref("userChrome.icon.menu.full",                      true);
// user_pref("userChrome.icon.global_menu.mac",                true);

// -- User Content -------------------------------------------------------------
// user_pref("userContent.player.ui.twoline",                  true);

// user_pref("userContent.newTab.hidden_logo",                 true);

// user_pref("userContent.page.proton_color.dark_blue_accent", true);
// user_pref("userContent.page.proton_color.system_accent",    true);
// user_pref("userContent.page.monospace",                     true);

// == Theme Default Settings ===================================================
// -- User Chrome --------------------------------------------------------------
user_pref("userChrome.compatibility.theme",       true);
user_pref("userChrome.compatibility.os",          true);

user_pref("userChrome.theme.built_in_contrast",   true);
user_pref("userChrome.theme.system_default",      true);
user_pref("userChrome.theme.proton_color",        true);
user_pref("userChrome.theme.proton_chrome",       true); // Need proton_color
user_pref("userChrome.theme.fully_color",         true); // Need proton_color
user_pref("userChrome.theme.fully_dark",          true); // Need proton_color

user_pref("userChrome.decoration.cursor",         true);
user_pref("userChrome.decoration.field_border",   true);
user_pref("userChrome.decoration.download_panel", true);
user_pref("userChrome.decoration.animate",        true);

user_pref("userChrome.padding.tabbar_width",      true);
user_pref("userChrome.padding.tabbar_height",     true);
user_pref("userChrome.padding.toolbar_button",    true);
user_pref("userChrome.padding.navbar_width",      true);
user_pref("userChrome.padding.urlbar",            true);
user_pref("userChrome.padding.bookmarkbar",       true);
user_pref("userChrome.padding.infobar",           true);
user_pref("userChrome.padding.menu",              true);
user_pref("userChrome.padding.bookmark_menu",     true);
user_pref("userChrome.padding.global_menubar",    false);
user_pref("userChrome.padding.panel",             true);
user_pref("userChrome.padding.popup_panel",       true);

user_pref("userChrome.tab.multi_selected",        true);
user_pref("userChrome.tab.unloaded",              false);
user_pref("userChrome.tab.letters_cleary",        true);
user_pref("userChrome.tab.close_button_at_hover", true);
user_pref("userChrome.tab.sound_hide_label",      true);
user_pref("userChrome.tab.sound_with_favicons",   true);
user_pref("userChrome.tab.pip",                   true);
user_pref("userChrome.tab.container",             true);
user_pref("userChrome.tab.crashed",               true);

user_pref("userChrome.fullscreen.overlap",        true);
user_pref("userChrome.fullscreen.show_bookmarkbar", true);

user_pref("userChrome.icon.library",              true);
user_pref("userChrome.icon.panel",                true);
user_pref("userChrome.icon.menu",                 true);
user_pref("userChrome.icon.context_menu",         true);
user_pref("userChrome.icon.global_menu",          true);
user_pref("userChrome.icon.global_menubar",       false);

// -- User Content -------------------------------------------------------------
user_pref("userContent.player.ui",             true);
user_pref("userContent.player.icon",           true);
user_pref("userContent.player.noaudio",        true);
user_pref("userContent.player.size",           true);
user_pref("userContent.player.click_to_play",  true);
user_pref("userContent.player.animate",        true);

user_pref("userContent.newTab.full_icon",      true);
user_pref("userContent.newTab.animate",        true);
user_pref("userContent.newTab.pocket_to_last", true);
user_pref("userContent.newTab.searchbar",      true);

user_pref("userContent.page.field_border",     true);
user_pref("userContent.page.illustration",     true);
user_pref("userContent.page.proton_color",     true);
user_pref("userContent.page.dark_mode",        true); // Need proton_color
user_pref("userContent.page.proton",           true); // Need proton_color

// ** Useful Options ***********************************************************
// Integrated calculator at urlbar
user_pref("browser.urlbar.suggest.calculator", true);

// Integrated unit convertor at urlbar
// user_pref("browser.urlbar.unitConversion.enabled", true);

// Draw in Titlebar
// user_pref("browser.tabs.drawInTitlebar", true);
// user_pref("browser.tabs.inTitlebar",        1); // Nightly, 96 Above

// ** Scrolling Settings *******************************************************
// == Only Sharpen Scrolling ===================================================
//         Pref                                             Value      Original
/*
user_pref("mousewheel.min_line_scroll_amount",                 10); //        5
user_pref("general.smoothScroll.mouseWheel.durationMinMS",     80); //       50
user_pref("general.smoothScroll.currentVelocityWeighting", "0.15"); //   "0.25"
user_pref("general.smoothScroll.stopDecelerationWeighting", "0.6"); //    "0.4"
*/

// == Smooth Scrolling ==========================================================
// ** Scrolling Options ********************************************************
// based on natural smooth scrolling v2 by aveyo
// this preset will reset couple extra variables for consistency
//         Pref                                              Value                 Original
/*
user_pref("apz.allow_zooming",                               true);            ///     true
user_pref("apz.force_disable_desktop_zooming_scrollbars",   false);            ///    false
user_pref("apz.paint_skipping.enabled",                      true);            ///     true
user_pref("apz.windows.use_direct_manipulation",             true);            ///     true
user_pref("dom.event.wheel-deltaMode-lines.always-disabled", true);            ///    false
user_pref("general.smoothScroll.currentVelocityWeighting", "0.12");            ///   "0.25" <- 1. If scroll too slow, set to "0.15"
user_pref("general.smoothScroll.durationToIntervalRatio",    1000);            ///      200
user_pref("general.smoothScroll.lines.durationMaxMS",         100);            ///      150
user_pref("general.smoothScroll.lines.durationMinMS",           0);            ///      150
user_pref("general.smoothScroll.mouseWheel.durationMaxMS",    100);            ///      200
user_pref("general.smoothScroll.mouseWheel.durationMinMS",      0);            ///       50
user_pref("general.smoothScroll.mouseWheel.migrationPercent", 100);            ///      100
user_pref("general.smoothScroll.msdPhysics.continuousMotionMaxDeltaMS", 12);   ///      120
user_pref("general.smoothScroll.msdPhysics.enabled",                  true);   ///    false
user_pref("general.smoothScroll.msdPhysics.motionBeginSpringConstant", 200);   ///     1250
user_pref("general.smoothScroll.msdPhysics.regularSpringConstant",     200);   ///     1000
user_pref("general.smoothScroll.msdPhysics.slowdownMinDeltaMS",         10);   ///       12
user_pref("general.smoothScroll.msdPhysics.slowdownMinDeltaRatio",  "1.20");   ///    "1.3"
user_pref("general.smoothScroll.msdPhysics.slowdownSpringConstant",   1000);   ///     2000
user_pref("general.smoothScroll.other.durationMaxMS",         100);            ///      150
user_pref("general.smoothScroll.other.durationMinMS",           0);            ///      150
user_pref("general.smoothScroll.pages.durationMaxMS",         100);            ///      150
user_pref("general.smoothScroll.pages.durationMinMS",           0);            ///      150
user_pref("general.smoothScroll.pixels.durationMaxMS",        100);            ///      150
user_pref("general.smoothScroll.pixels.durationMinMS",          0);            ///      150
user_pref("general.smoothScroll.scrollbars.durationMaxMS",    100);            ///      150
user_pref("general.smoothScroll.scrollbars.durationMinMS",      0);            ///      150
user_pref("general.smoothScroll.stopDecelerationWeighting", "0.6");            ///    "0.4"
user_pref("layers.async-pan-zoom.enabled",                   true);            ///     true
user_pref("layout.css.scroll-behavior.spring-constant",   "250.0");            ///   "250.0"
user_pref("mousewheel.acceleration.factor",                     3);            ///       10
user_pref("mousewheel.acceleration.start",                     -1);            ///       -1
user_pref("mousewheel.default.delta_multiplier_x",            100);            ///      100
user_pref("mousewheel.default.delta_multiplier_y",            100);            ///      100
user_pref("mousewheel.default.delta_multiplier_z",            100);            ///      100
user_pref("mousewheel.min_line_scroll_amount",                  0);            ///        5
user_pref("mousewheel.system_scroll_override.enabled",       true);            ///     true <- 2. If scroll too fast, set to false
user_pref("mousewheel.system_scroll_override_on_root_content.enabled", false); ///     true
user_pref("mousewheel.transaction.timeout",                  1500);            ///     1500
user_pref("toolkit.scrollbox.horizontalScrollDistance",         4);            ///        5
user_pref("toolkit.scrollbox.verticalScrollDistance",           3);            ///        3
*/

Additional context

No response

[menma1234]

If it helps, playing around a bit myself, this bit of CSS appears to be causing it (from tabs.css):

:root:not([privatebrowsingmode=temporary]) :is(toolbarbutton, toolbarpaletteitem) + #tabbrowser-tabs,
:root[privatebrowsingmode=temporary] :is(toolbarbutton:not(#firefox-view-button), toolbarpaletteitem:not(#wrapper-firefox-view-button)) + #tabbrowser-tabs {
  border-inline-start: 1px solid color-mix(in srgb, currentColor 25%, transparent);
  padding-inline-start: calc(var(--tab-overflow-pinned-tabs-width) + 2px);
  margin-inline-start: 2px;
}

If you get rid of border-inline-start then the problem goes away, and getting rid of padding-inline-start gets rid of the extra space that came with it. Seems like it has to do with Firefox View and I got rid of that icon.

[black7375]

Now, disabled at photon style