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A while back, Firefox got an option to only load tabs when they are clicked, which makes Firefox a lot faster if you have many open tabs.

But this was only implemented for regular tabs and didn't work for app tabs (pinned tabs), until Firefox 12 which got an about:config option to load app tabs on demand too.

firefox load app tabs on demand

So if you're using Firefox 12+ (Firefox Beta, Aurora or Nightly) and want app tabs to load only when clicked, type "about:config" in the Firefox location bar, then enter:
browser.sessionstore.restore_pinned_tabs_on_demand
in the search box and double click it (or right click it and select "Toggle") so it's value becomes "true".

firefox dont load tabs until selected

This won't work unless you also set regular tabs to load on demand so in the Firefox Preferences, on the "Tabs" tab, make sure "Don't load tabs until selected" is checked.

Now restart Firefox and the app tabs should only load when selected, just like regular tabs.
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