Firefox Is One Of The Most Popular And Most Used Browser. Firefox Downloads Increases Day By Day. Firefox Have Many Great Features That Make Users Necessary To Use It. As It’s Most Used Browser, It Has Many Errors And Issues Reported Daily. This Error Is Reported By Many Users. So, We Have A Solution For It Here.

Some Users Trying To Reset Firefox To Fix This Issue, But It Delete All Of Files And Cookies. So, That’s Not Wise To Reset Firefox. So, We Have Am Easy Solution For This Error.

What Is The Error Exactly :

When User Start Firefox, The Add-on Compatibility Check Window Displays Every Time. This Error Is Often Came When Someone’s Updated From Old Version To New version Of Firefox.
How To Stop Firefox From Checking Add-on Compatibility Every Time :

Go To Firefox, Click On Menu→ Help→ Troubleshooting Problem.

Here, Click On Show Folder Button And You Will Taken To Your Profile Folder Of Firefox.

Here Find These 3 Files And Delete Them : Prefs.js, User.js and Sessionstore.js

That’s It. Now Restart Firefox And You’ll Not Get Add-on Compatibility Dialogue Anymore.