I consider myself a pretty advanced Firefox user. I use it every day, after all, so it’s only natural that my proficiency has steadily increased. That being said, it’s no surprise that when I open my browser multiple tabs open along with it. Here’s a tip on how to do that.
The only issue I’ve come across is that by opening multiple tabs at the same time things get a little…slow, let’s just say. Sometimes they freeze, in fact.
Thankfully, a fix is as simple as a couple of clicks.
So, open Firefox and click Tools>Options (or, if you have the orange Firefox button, click that, then Tools>Options).
Under the General tab, make sure the box next to Don’t load tabs until selected is checked and hit OK. 
Now when you open Firefox, it’ll open all of your tabs, but won’t load the pages contained within those tabs until you click on them!
Saves resources and a headache to boot!
~Andrew
Tags: firefox, Multi-tabs, tabs
“Don’t Load tabs until selected” does not appear on my computer under tools-options, general as you describe.
For Sally, I had to change “When Firefox starts” to the Show my windows & tabs from last time.
Great, thanks for the information
“Don’t load tabs until selected” is grayed out – I can’t click on it.
Andrew,
Is There Anyway this procedure; “Firefox – Don’t Load Tabs Until Selected” In 08 Dec 11 “Computer Tips News Letter” Can Be Applied TO IE Version 8 ?
Thanks to your excellent tip on a very annoying crashes due to overloading overflow with blue screen. I have yet to try out to see if my so called upgraded Firefox has the necessary to be effective.
“Don’t load tabs until selected” is grayed
solution:
first select when firefox starts:show my windows and tabs from last time
How do you make it work on ff 3.6.27? (This version works best on my computer)