There are many add-ons available for firefox and thunderbird, but most them are never updated according to the new versions of product releases. If you try to install them you will see version compatibility error. There is a simple way to resolve this compatibility issue. Download the add-on by clicking “save as” in browser context menu, the downloaded file is with xpi file. Open the xpi file using winzip and find install.rdf file(no need to extract the zip file) and open it in any text editor. Search for “{ec8030f7-c20a-464f-9b0e-13a3a9e97384}” which is firefox id and for thunderbird “{3550f703-e582-4d05-9a08-453d09bdfdc6}” . RDF file is xml file under the id you should see\r\n\r\n<em:minVersion>1.5<//em:minVersion>\r\n<em:maxVersion>2.0.0.*</em:maxVersion>\r\n\r\nChange the maxVersion value to the version you are using. If you are using firefox 3 beta then the maxVersion should be 3.0b3 (remember from firefox three versioning has changed now on its going to x.0 only instead of x.0.0).

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