[idoubtit]

> don't blindly apply settings from this list.

Unfortunately, there is no real documentation of the various about:config parameters. So one has to trust doubtful sources on what settings would be useful, or spend many hours reading the source code of Firefox.

I don't understand why each setting is not documented on the about:config page. It would bind the documentation to the release, providing the info suitable for the FF version. I can't see any drawback, except that developers would have to provide a small description of every setting they introduce, which I hope they already do somewhere.

Here is my own frustrating experience with about:config. I sometimes hit Ctrl-q when I meant Ctrl-w. So instead of closing a tab in FF, I close the application and loose my input on some pages. I tried to restore the (previously default) behavior of asking for confirmation before quitting. I had 2 settings in "about:config" named "browser.warnOnQuit" and "browser.showQuitWarning". Only the former one is documented in the mozillaZine wiki. It seems the latter was the old name of this setting, which FF updates never migrated.

So I changed the config, and nothing happened. After several variations, I headed for the source code of FF, and saw this setting was ignored when "restoring sessions" was active. There is no way to ask for confirmation in modern FF.

[nathancahill]

This was just fixed in the latest release.