Many times you might have noticed an add-on works just fine in a more recent version but firefox wont let you install them, because they have not been tested for compatibility against the recent version. There are ways to circumvent this forced protection, we will describe a few of them here … but be forewarned … these methods are risky and may destabilize your firefox installation. In such cases open firefox in safe mode and disable these addons. In the previous post we wrote about Firefox 4 beta , and thought that many people might have been facing this problem.
So, here’s the solution on how to make an incompatible add-on compatible for Firefox :
Option #1. One way to do so would be to install an add-on from mozilla itself called Compatibility Reporter which is primarily intended for users who wish to test and report the compatibility of add-ons with various Firefox releases.
The interesting part about this add-on is that it will automatically configure your Firefox to install and use add-ons that are otherwise incompatible with your release of Firefox.
Option #2. This method is not recommended because making incorrect changes to firefox configuration can play havoc with your browser, for those still interested : type about:config in your browser address bar and agree to the warning message. Now right click inside the browser, choose New –> Boolean, type the preference name as extensions.checkCompatibility.4.0b and set it to False.
Option #3.If there are one or two addons that you want to try out, then disable compatibility checking against all addons might not be a good idea. Instead of doing the same, you can download the extension (the .xpi file) to your computer, unzip it and change the value of em:maxVersion under install.rdf file to 4.0.* – now pack the extension again and drag-n-drop to your Firefox browser. This might be a bit cumbersome for inexperienced users.
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That looks simple, I would try it in my free time. :)