closetotheedge, I am sorry to say that there is not Full list as there is over a billion of them on there. (Sarcasm). But, there are a lot mentioned in this KB Article on Mozillazine listed below: http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries

For normal settings and for tab settings, and search for some more hidden ones can be turned up in mozillazine.org '''More information on configuration variables''' available in [http://kb.mozillazine.org/About:config_entries about:config (entries)] and for users not familiar with the process there is [http://kb.mozillazine.org/About:config about:config (How to change)] -- Specialized list of only [http://dmcritchie.mvps.org/firefox/tabs_config.htm Tabs configuration] variables. This is what I use for most searches of MozillaZine (keyword is :: ) http://www.google.com/search?num=100&hl=en&newwindow=1&q=site%3Akb.mozillazine.org+-intitle%3Atalk+-inurl:%22/index.php?title=%22+-inurl%3A%22%2Findex.php%3Ftitle%3D%22+%S+-intitle:talk&btnG=Search From the bugzilla reports there was probably discussion in a developer newsgroup, but it also looks like it may no longer be used, is a one time use per user, or was during beta testing, It was not documented on MozillaZine by someone who knows or has found it elsewhere. When you get something that rare, you can do an unqualified Google search (got 8 hits), turned nothing of particular interest, you would have to check the code, there was a reference to source forge that I did not include. * Bug 627215 – Post-FF4: Enable browser.sessionhistory.optimize_eviction<br>https://bugzilla.mozilla.org/show_bug.cgi?id=627215 * Browser Backspace -- mozillaZine Forums<br>http://forums.mozillazine.org/viewtopic.php?f=38&amp;t=2165687

http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries is not the real list, it is redirected see the note at the top of the page when you use it and where you actually went to.