Those of you trying out the Firefox 3 beta or considering it may want access to firefox 2. This is particularly true for developers as you will want to test in both version of the browser and the much loved Firebug plugin is not supported in Firefox 3 yet.
Fortunately there is an excellent guide on getting both Firefox 2 and Firefox 3 running at the same time thanks to Hikikomori’s blog redemption in a blog
The problem I encountered is Windows Media Player video embedded in a page will not play. I tried re-installing the plugin but while this works for firefox 2 it does not for firefox 3.
I then recalled I encountered this same problem when first upgrading to Vista. A fix is to copy the needed dll files into the firefox 3 plugin folder. You can just copy the files over from firefox 2 plugins folder or download only the required ones from dll dump.
Quote from last blog post on this topic:
You can find the missing files on dlldump.com
If this doesn’t solve the problem get more indepth help here: http://forums.mozillazine.org/viewtopic.php?t=206213
