After updating to FireFox 16.0.1 in Windows, the address bar stopped working, as well as the search bar, though not immediately. Reinstall didn't fix it.

Question

Initially I downloaded an AOL-optimized version, but when the problems came up I reinstalled the regular version and it was fine. Two days ago it randomly started again. Address bar won't go anywhere with enter or pressing the arrow button, and the search bar has no search engine. Trying add a search engine by clicking "manage search engines" doesn't help; the "add search enginges" button is unresponsive and there are none in the list to choose from. I uninstalled everything including my customizations and personal settings and reinstalled, which still didn't help. I tried disabling all the plugins and that didn't work either. I even tried searching from the FireFox home page search, since at that point it was the only page I could get to, and even that wouldn't search. The most recent add-on I downloaded was the Evernote Web Clipper I think, but it didn't seem to coincide with the start of the problems.
Update: I ran a malware program (MalWareBytes) and it came up with nothing. I also got back into FireFox to get the Troubleshooting Information and added it in. In addition, here's my complete plugin/extension list:
Plugins:
Foxit Reader Plugin for Mozilla 2.2.1.530
Google Earth Plugin 6.2.0.5788
Google Update 1.3.21.123
Java Deployment Toolkit 7.0.90.5 10.9.2.5
Java (TM) Platform SE 7 U9 10.9.2.5
Microsoft Office 2010 14.0.4761.1000
Microsoft Office 2010 14.0.4730.1010
Microsoft Windows Media Services 4.1.0.3917
Shockwave Flash 11.4.402.287
Silverlight Plugin 4.1.10329.0
Windows Live Photo Gallery 14.0.8081.709
Extensions:
avast! WebRep 7.0.1473

Answer 1

Sorry you are having problems. First of all try Fifrefox's safemode.
*[[Troubleshoot Firefox issues using Safe Mode]]
If that works post back for further advice.
Next step, if safe mode did not work.
<u>First: Try a clean install, _{(you have had a none standard version installed previously)}</u><br /> that involves deleting the program files. Then if necessary try troubleshooting by creating and using a clean empty Firefox profile.
See
* this recent post [/questions/940399#answer-377134]
* http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
<u>Second: try a New Profile</u>
*http://kb.mozillazine.org/Profile_Manager#Creating_a_new_profile
* this will be an additional profile, it is still worth backing up any existing or currently working profile on a regular basis
**[[Back up and restore information in Firefox profiles]]
* Until you are absolutely confident about the repercussions I suggest
** always use an empty folder when creating a new profile
** never delete or rename profiles, just disable or remove shortcuts
** after creating a new test profile open it and check for any addons or plugins that may be have been included by default