Make the Snap Links add-on work with Firefox 3

I couldn't wait any longer for the Firefox add-on Snap Links to be updated for Firefox 3, so I changed the supported version number myself to make it work. 

On your Mac, assuming you've installed Snap Links, quit Firefox and navigate to your user's Library » Application Support » Firefox » Profiles » [random].default » extensions » snaplinks@snaplink.net folder. In that folder, open install.rdf in a text editor. Change the MaxVersion number from 3.0beta number to just 3.0 and save the file. Now launch Firefox, and Snap Links should appear in the addon list as available now.