Um, Ok. But, IMHO I think you got it backwards your Add-ons are unstable not Firefox.

See:

• http://kb.mozillazine.org/Firefox_crashes
• https://support.mozilla.com/kb/Firefox+crashes

If you have submitted Breakpad crash reports then post the IDs of one or more Breakpad crash reports (bp-xxxxxxxx-xxxxxxxxx-xxxx-xxxxxxxxxxxx).
You can find the IDs of the submitted crash reports on the about:crashes page.
You can open the about:crashes page via the location bar, like you open a website.

See:

• http://kb.mozillazine.org/Breakpad (Mozilla Crash Reporter)
• https://support.mozilla.com/kb/Mozilla+Crash+Reporter

FF5 worked with add-ons IE9 and chrome work with add-ons FF6 works on my mac with add-ons. I'm not the only person haveing this problem. Been using FF since it first came out and I know how it should work. Their home page tells you how to customize the browser with add-ons. Want to use the add-ons even if its with a different browser

If Firefox cannot start then submit at least on crash report with the reporter that comes up then look in Windows 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\ for .txt files in Submit folder and post the numbers here.

Sent the crash reports, 27 times. easier to change browsers than research the internet and try to fix their program.

bryan can you please post at least a few of the crash report numbers as was asked for as they could help explain what is causing Firefox 6.0.* to crash and the fix. There has been at least two main causes lately, a trojan malware and Comcast's "Constant Guard" due to IDVault.

In these two cases the crash reports usually link to the related bug reports on the culprit.

If Firefox can start then type in about:crashes in the Location (address) bar. If Firefox cannot start then look for the .txt file in submit folder located in Windows 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\

http://kb.mozillazine.org/Breakpad#Location_of_crash_reports

Also in this case the Addons you are referring to are called Extensions in Firefox.