(bug) Nebulate doesn't ask URL permissions in Firefox

[hadrienbecle]

Hi,

On Firefox ESR 115, after downloading Nebulate from AMO, the database didn't seem to be synced:

After some debugging, I found that the problem was caused by permissions not being asked by the extension at first launch. The extension works perfectly when enabling them manually and relaunching the extension through about:debugging.

According to the WebExtension documentation (manifest.json > host_permissions > Requested permissions and user prompts), the extension should use permissions.contains and permissions.request at first launch because most browsers apart from Chrome (mainly Firefox and Safari) consider host_permissions to be optional permissions.

(also, to make things even simpler, it might change in the future with the introduction of yet another manifest.json property...)