What fixed your problem was not a *Firefox* update, it was a *NoScript" update. You can get those automatically by configuring Firefox > Tools > Options > Advanced > Update > "Automatically check for updates to:
You probably already have "Firefox" checked. Just also check "Installed Add-Ons". Fx will then regularly check for updates to NoScript and all of your other add-ons.
You can also check manually at any time via Fx > Tools > Add-ons > Find Updates.
The reason you would not have gotten this one is that the recommendation from NoScript developer Giorgio Maone was "Just upgrade to latest development build" with the link. "Development build" means the improvements he is continually adding and testing at any given moment, but have not yet been released as the official stable release. That is why you needed to be directed via the link to get it manually. As soon as that version becomes the official stable version, Mozilla automatic updates should have it for you (sometimes they are a little tardy, but not for too long.)
Please don't take offense at GµårÐïåñ's post. From another post of his, I read that he is just going to sleep after working 38 hours straight (including numerous excellent posts here), and I think we all would be a little "off" in that condition. If you hang around here, which we welcome you to do, you'll find that he is extremely knowledgeable, helpful, and friendly, as all of us try to be, although like all humans, we all have our "off" moments.
And yes, Giorgio is brilliant. That is why we volunteer to help, as he can't by himself possibly build the program *and* run the entire support forum, with the fastest response time I or most people have ever seen, plus do minor things like make a living (NS is free, but you can donate if you like, no nagware, ever), eat, sleep, hold his new baby (and baby's mother

, play, study, read multiple web sources for new vulnerabilities to fix, fix them, respond to articles that misrepresent NS, exercise... Perhaps some day, you'll help us help him?
Cheers!
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.20) Gecko/20081217 Firefox/2.0.0.20