going back 2 or 3 years or more to find old bugzillas if they exist

@Thorin-Oakenpants yeah this is a chore, searching on https://hg.mozilla.org/mozilla-central/ can help a lot when looking for a particular change (an equivalent would be hg clone https://hg.mozilla.org/mozilla-central/ and searching the log with hg log...). Whereas DXR only shows the codebase at a set point (tip/release/esr52/esr45/esr31...), you have to manually switch branches/use Blame to find changes...

For example searching for https://hg.mozilla.org/mozilla-central/log?rev=browser.sessionstore.enabled shows that it was removed in https://hg.mozilla.org/mozilla-central/rev/e712e96d7861 (there's also a link to bug 449596 in that commit message). Easier than digging bugzilla or DXR. (Though the pref name must be in the commit message).

hg.mozilla.org has a log dating back to Firefox 3.5 (release branch mozilla-1.9.1, July 2011).

browser.urlbar.maxRichResults

@pyllyukko removed it in 116d986 but wrongly, I believe, it does have the effect I describe (doesn't it?), please check the commit comment if you have time.

browser.download.manager.retention

Still present in ESR45, 52, and in the current release (53), not there anymore in the latest firefox-central revision (unreleased). What is wrong about it? (another issue?)

I agree with @pyllyukko that facts based on actual code changes are very important to me (user testing can sometimes be misleading - I think I just sent a patch for the wrong pref in #300 ).

The underlying problem is that Mozilla has no documentation for what the prefs do. It would make things much easier to maintain. Might be worth opening a bugzilla ticket and and asking the maintainers if they'd like the idea.

privacy.clearOnShutdown.passwords was removed in Firefox 42 #290

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