Firefox by Mozilla Corp. is one of the most successful browsers in recent time. In some newer versions or beta versions of Mozilla Firefox many add-ons are unsupported.If you want to make them run I got a trick by using that most of (Not Every) add-on can work on your Firefox.
STEP 1: Get Your Add Ons.
First of all you have to download your add-on.Probably you can’t get it from Firefox because they don’t allow you to install unsupported add-ons.
Download your add-on from another browser.Here I am downloading from chrome.Your add-on extension would be .xpi
STEP 2: Make it Capable for Your Version.
Now open your add-on from 7-zip file manager.You will see file named Install.rdf do right-click and click on it and choose EDIT.Open it in Notepad. You will find a line like this: <em:maxVersion>3.0.1
Now edit version with your Firefox version.Save file.And …its ready for your Firefox…
Go in add-on panel.Select option Install From File.Select your edited file.Install.Restart.And you are done…
Let me show you Example…
Here is I am using Firefox 4.0.1 beta.I got add-on Smart Bookmarks which doesn’t support this version.
I downloaded this from chrome.
Edited Insall.rdf file in 7-zip file manager.Saved it.
Installed in Firefox.
NOTE: Every add-on does not support this trick.Try this with your add-on and check how lucky you are…