One and all should go grab the new version of firefox that’s out, it’s the best browser available these days by a long shot. Mac users will find this handy – instructions on how to make sure firefox ALWAYS opens new links in a tab instead of in a new window:

For the users that complain that links/URLs from external apps don not open in tabs but new windows you can change the behavior as follows. you need to edit the mozilla startup script(I have been doing this way back by entering some code manually but now they have in entered for you you need only comment and uncomment a line.) To do this edit //firefox.app/Contents/MacOS/firefox You can do this on the command line with vi if you know how or you can use textedit in the finder(you must also right click/control click on your firefox application and select show package contents to do this in the finder). in the script about 190 lines down you will see two lines “_open_type=”window”” and “#_open_type=”tab”” comment the window line so that it looks like #_open_type=”window” then remove the # sign from the tab line. Now firefox will spawn new tabs from links from external apps… Hope this helps some users out there…

I got these instructions off of versiontracker.com, kudos to db23 for posting this.