After searching lot, fortunately i found a solution for this error on howtogeek.com. They have given a cool tips to make extension compatible with your Firefox version. According to them:-
Type about:config into the address bar, and then after clicking through the warning, you’ll want to right-click in the list and choose New –> Boolean from the menu.
Now you’ll be prompted to enter the preference name.This is where you need to pay attention to the exact version you are using, because the preference has to be set for the exact version of Firefox you are using. For version Firefox 3.6b3, enter exactly this
Code:
extensions.checkCompatibility.3.6b
Basically the format is extensions.checkCompatibility.VERSION.b for Beta releases or extensions.checkCompatibility.VERSION.a for Alpha releases. So if you were testing out Firefox 3.8 Alpha, you’d use extensions.checkCompatibility.3.8a as the preference name.
On the next dialog, just choose “false” and close the dialog.
You should now see the value in the list if you filter for it.
And your extensions should now install. If they don’t, then you probably put the wrong version into the preference name.
Thats it !!!
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