Firefox 3 beta have been released, and if you have been reading DailyGyan, you already know how to run Firefox 2 along with Firefox 3.
But Firefox 3 beta has a serious issue. Lack of extensions!
Many extension writers are waiting for the official release of Firefox3 before porting there extension to it. The result is that many of our beloved extensions refuse to install in Firefox3.
In this How To, I'll show you how to install a Firefox2 extension in Firefox3 beta using the official del.icio.us Firefox extension as an example.
Update: LifeHacker blog suggests the following procedure.
(However, I couldn't get this method to work for me. Even after setting the two values, firefox was still doing compatibility check and failed to install the extensions.)
about:config into Firefox's address bar and click the "I'll be careful, I promise!" button.
extensions.checkCompatibility and set it to
extensions.checkUpdateSecurity and set the value to
Related: Official Delicious Extension for Firefox 3 Beta