Thanks it works!
I have another question about firefox tab switching. I currently use Ctrl-Tab add-on to switch between recently viewed tabs. It worked well in windows but not so much with mac. When I hold ctrl and press tab few times, in windows i can cycle through all the tabs in order of time I last open them, but in mac version of firefox, i can only go back 1-2 tabs. Furthermore, ctrl(cmd) Q to view all my tabs in 1 plane just stopped working all together.
Any recommendation on add-ons or fixes that will make tab switching less painful?