Force Extension Compatibility with Firefox 3.6+

Forcing Extension Compatibility in Firefox 3.6 and Later

Users who have upgraded to Firefox 3.6 may find that some of their previously installed extensions are no longer functional. The traditional method of checking compatibility may also prove ineffective. However, a workaround exists to address this issue.

This issue is often signaled by an error message when attempting to install an incompatible extension. It’s crucial to note the specific Firefox version string displayed within this message, as it will be required in the following steps.

Modifying Firefox Configuration

Begin by typing "about:config" into the browser's address bar. A warning message will appear; proceed by clicking through it.

Within the configuration list, right-click and select "New" then "Boolean" from the context menu.

Setting the Preference Name

A prompt will appear requesting the preference name. Accuracy is paramount here, as the name must precisely match the Firefox version in use.

For Firefox 3.6b3, as indicated in the error message, the preference name should be:

extensions.checkCompatibility.3.6

The general format for Beta releases is "extensions.checkCompatibility.VERSION.b", while Alpha releases utilize "extensions.checkCompatibility.VERSION.a". For example, Firefox 3.8 Alpha would require "extensions.checkCompatibility.3.8a".

Completing the Configuration

In the subsequent dialog box, select "false" and then close the window.

The newly created preference should now be visible in the configuration list when filtered for.

Installing Extensions

Attempt to install the extension again. If the installation fails, double-check the accuracy of the version number used in the preference name.

This method provides a valuable solution for maintaining functionality of older extensions within newer Firefox versions, and is likely to be a frequently used technique.