First time through, cnn.com blocked, & so very possibly everything blocked.
Loaded speedily, no problems with tabs or opening links.
Second time, I Allowed Globally.
Took LOTS of time before finally finished loading.
Then Clicked one link, jumped to another tab, clicked on another. The second link seemed as if it is going to take a long time before it responds & so here I am typing this <in SeaMonkey, testing in FF>. Still in SeaMonkey, watching Process Hacker, I'm seeing (FF) CPU usage periodically jumping to 25% CPU (1 core), which I have to assume is related to Flash.
Clicking on some links & FF is struggling. I'm about to give up on it in a moment ...
FF definitely not responding appropriately. Going to kill it, or shut it down if I can catch it at the right moment.
It's in a loop. CPU, relaxes, CPU, relaxes. You have momentary responsiveness during relaxed state, but when CPU kicks in, not much you can do. (Can't even scroll in Error Console to view XSS information.)
I have seen these types of loops before (in SeaMonkey) & I know that once they start, there is no way to stop them. Closing much down, may extent slightly your browsing session, but soon you will say enough is enough & restart.
(Even though this is happening, nothing to say that it is NoScript related. Once I can get disabled, I'll restart without NoScript ...)
Now restart, NoScript (& it turns out FlashGot & Adblock Plus & BarTab too) disabled, I'm getting a much different, better experience. (I shut down & reopened from Session Restore.) Gone is the looping. I click a link, CPU usage goes up (as expected) as the page loads, then returns back down. Jump to another tab, repeat with the same results.
So looks like NoScript could be causing ...
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:126.96.36.199) Gecko/20110420 SeaMonkey/2.0.14 Pinball NoScript FlashGot AdblockPlus
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:188.8.131.52pre) Gecko/20110227 SeaMonkey/2.0.13pre