>>106885003
Actually, I take it back, I do remember encountering something like that, but it's only when opening a ton of tabs, 100+ all at once and even then it's very rare. I use an extension that opens the tabs unloaded. If anyone wants it, it's this:
https://addons.mozilla.org/en-US/firefox/addon/load-background-tabs-on-select/
Pin it to the taskbar and click it for on/off.