4b2 causes problem with javascript
Error after upgrading
This happened
Every time Firefox opened
after upgrading to 4b2
User Agent
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152)
Chosen solution
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
You can also discuss issues with Namoroka 3.6 and Minefield 4.0 nightly and alpha/beta builds at the MozillaZine Firefox Builds forum. That forum is better suited to discuss such issues. You need to register on the MozillaZine forum site in order to post at that forum.
See http://forums.mozillazine.org/viewforum.php?f=23
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Chosen Solution
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
You can also discuss issues with Namoroka 3.6 and Minefield 4.0 nightly and alpha/beta builds at the MozillaZine Firefox Builds forum. That forum is better suited to discuss such issues. You need to register on the MozillaZine forum site in order to post at that forum.