Do you want the tabs to already be loaded when you click on them? Because if you do that, you could cause Firefox to load much more slowly or hang depending on the specs or performance of your computer.

But to disable the reloading of tabs aka "Don't load tabs until selected": Click the 3-line menu button > General > uncheck "Don't load tabs until selected". Close the tab and restart Firefox.

If Firefox loads too slowly or starts freezing after this, please return to this area and enable the option again.

I've already tried that, didn't solve the problem. But thank you.

FIGURED IT OUT!!!!! I FEEL DUMB TOO!!! The long and short of it, I got a new computer and with the new look of Mozilla, I was trying to pin the tabs above the IP address bar....they should be BELOW the IP address bar!!!!!! Problem Solved!!!!