it pops a warning up asking are you sure you want to navigate away from thus page because you have a server request pending...or gets into loop connecting and then loading again...its a firefox issue and not a g-mail issue..I installed a old version of firefox ...pre 2.0 not sure of the version and it does not do this type of behavior at all...and the truth be told...it loads faster and runs noticeably faster...just can't use the tabmix plus or several of my favorite extensions
it has caused me to try goggles chrome browser...will report on my experiences with chrome...