Not all Firefox default preferences are detected by 'make tests'

[nodiscc]

Followup to #208 (comment):

make tests allows downloading Firefox source files responsible for setting default config values (https://github.com/pyllyukko/user.js/blob/master/Makefile#L13), and allows comparisons (pref deprecation, newly added prefs...) with this user.js. However not all available Firefox preferences seem to be listed by this method:

There are definitely some prefs that are created/checked randomly through the code (eg https://dxr.mozilla.org/mozilla-central/source/dom/base/Navigator.cpp?q=general.oscpu.override&redirect_type=single#479).

Example preferences that we could not detect, but appear to be valid/effective prefs:

• browser.search.region
• javascript.use_us_english_locale
• toolkit.telemetry.unifiedIsOptIn
• datareporting.healthreport.service.enabled
• browser.selfsupport.enabled
• social.enabled
• services.sync.enabled
• network.dns.disablePrefetchFromHTTPS
• permissions.memory_only
• security.ssl.disable_session_identifiers
• security.nocertdb
• font.system.whitelist
• media.gmp-gmpopenh264.enabled
• dom.allow_cut_copy
• browser.tabs.remote.force-enable
• general.useragent.override
• general.buildID.override
• general.appname.override
• general.appversion.override
• general.platform.override
• general.oscpu.override
• ui.submenuDelay
• privacy.donottrackheader.value

Find a way to detect such preferences.

More possibly "hidden" prefs sources to consider, requires more research.

• https://dxr.mozilla.org/mozilla-central/search?q=const+PREF&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=%3Cpreference+id%3D&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=getBoolPref(&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=setBoolPref(&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=Preferences%3A%3ASet&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=Preferences%3A%3AGet&redirect=false
• https://dxr.mozilla.org/mozilla-central/search?q=pushPref&redirect=false

[nodiscc]

I'm no longer working on this.