Blank pages in 4.0 RC Rated 5 out of 5 stars

Just found this add-on and in theory it is everything I ever wanted in FF.

Doesn't seem to work well in FF 4.0 RC as unloaded pages show blank white pages when selected. To display the contents you need to refresh the page. Issue 111 created for this: https://github.com/philikon/BarTab/issues/#issue/111