Update: Thanks to Ken Saunders for the suggestion to use 7-Zip instead of WinRAR. Using 7-Zip greatly simplifies this process. I downloaded and installed Firefox 3.7a6pe today (more on this in another post). Everything was going fairly well until I started to move my extensions over from Firefox 3.6 profile. I was going to start with Nightly Tester Tools, but found out it is only compatible up to Firefox 3.7a5. Simple enough, I’ll just apply the Overriding Add-ons Compatibility Check Tweak I wrote earlier this year. That doesn’t seem to work with Firefox 3.7 or it may be related to…