I updated from Firefox 13.0.1 to 14.0.1 and every time I start Firefox I get a window that checks for compatibility of add ons then when Firefox loads up it opens two tabs, one is the welcome page and the othr is my home page
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You can try to Reset Firefox via Help (Alt + H) > Troubleshooting Information.
(To revert to the previous profile, close the new profile, start Firefox and choose the *.default profile. While the Profile Manager is open, you can also delete the newly reset profile (the one containing random numbers)).
Which security software (firewall, anti-virus) do you have?
For Avast you can check:
- Avast -> Additional Protection -> Browser Protection -> under Mozilla Firefox, uncheck the "Run this browser sandboxed" checkbox
You can check the home page setting.
- https://support.mozilla.org/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.
See "Corrupt extension files":
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
I thank you for the reply it was very helpful. I reset Firefox and now it is working perfectly.