Add/update Firefox data for Navigator API (#6830)

This commit updates the Firefox data for the Navigator API using the
mdn-bcd-collector project, aided with a little manual testing, to
achieve more real data for the Navigator API.

Tests used: https://mdn-bcd-collector.appspot.com/tests/api/Navigator

api/Navigator.json

@@ -598,10 +598,10 @@
               "version_added": "18"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "61"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "61"
             },
             "ie": {
               "version_added": false
@@ -646,10 +646,10 @@
               "version_added": "79"
             },
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": false
             },
             "ie": {
               "version_added": false
@@ -1184,10 +1184,10 @@
               "version_added": "79"
             },
             "firefox": {
-              "version_added": null
+              "version_added": false
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": false
             },
             "ie": {
               "version_added": false
@@ -1450,10 +1450,10 @@
               "version_added": "79"
             },
             "firefox": {
-              "version_added": "71"
+              "version_added": false
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": false
             },
             "ie": {
               "version_added": false
@@ -1548,11 +1548,12 @@
               "version_added": false
             },
             "firefox": {
-              "version_added": true,
+              "version_added": "1",
               "notes": "The preference <code>\"general.oscpu.override\"</code> can be used to set a value to be returned instead of the true CPU description. The preference setting is ignored for calls made by privileged code, which continue to get the actual CPU description."
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "4",
+              "notes": "The preference <code>\"general.oscpu.override\"</code> can be used to set a value to be returned instead of the true CPU description. The preference setting is ignored for calls made by privileged code, which continue to get the actual CPU description."
             },
             "ie": {
               "version_added": false
@@ -1710,10 +1711,10 @@
               "notes": "Always returns <code>20030107</code>."
             },
             "firefox": {
-              "version_added": true
+              "version_added": "1"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "4"
             },
             "ie": {
               "version_added": false
@@ -1922,15 +1923,15 @@
               "version_added": "13"
             },
             "firefox": {
-              "version_added": true,
+              "version_added": "38",
               "notes": [
                 "Starting in Firefox 55, if neither <code>audioCapabilities</code> nor <code>videoCapabilities</code> is specified in <code>supportedConfigurations</code>, a warning is output to the web console.",
                 "In addition, starting in Firefox 55, if in <code>supportedConfigurations</code>, either <code>audioCapabilities</code>'s or <code>videoCapabilities</code>'s <code>contentType</code> value doesn't specify a </code>\"codecs\"</code> substring to define allowed codecs within the media wrapper, a warning is output to the web console. See note below table for example and correction.",
                 "In the future, if neither <code>audioCapabilities</code> nor <code>videoCapabilities</code> is specified in the <code>supportedConfigurations</code>, a <code>NotSupported</code> exception will be thrown."
               ]
             },
             "firefox_android": {
-              "version_added": true,
+              "version_added": "38",
               "notes": [
                 "Starting in Firefox 55, if neither <code>audioCapabilities</code> nor <code>videoCapabilities</code> is specified in <code>supportedConfigurations</code>, a warning is output to the web console.",
                 "In addition, starting in Firefox 55, if in <code>supportedConfigurations</code>, either <code>audioCapabilities</code>'s or <code>videoCapabilities</code>'s <code>contentType</code> value doesn't specify a </code>\"codecs\"</code> substring to define allowed codecs within the media wrapper, a warning is output to the web console. See note below table for example and correction.",
@@ -2158,10 +2159,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "1"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "4"
             },
             "ie": {
               "version_added": "11"
@@ -2206,7 +2207,7 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "1"
             },
             "firefox_android": {
               "version_added": "4"
@@ -2384,10 +2385,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "60"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "60"
             },
             "ie": {
               "version_added": "11"