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Re:Multi-process Firefox brings 400-700% improvement in resp... by yoasif_ on Tuesday September 06, 2016 @05:22PM (#12439391)
> I have been searching in vain for something like that: stop scripts in background tabs except for specifically whitelisted pages.

Have you tried UnloadTab?

https://addons.mozilla.org/en-US/firefox/addon/unloadtab/

Re:Multi-process Firefox brings 400-700% improvement in resp... by reitanqild on Wednesday September 07, 2016 @10:26AM (#12443634)
Ok. Will try. I think I see an issue here where I want to go back to a tab I have open on the train home.

If it is unloaded that means I have to connect to the Internet again to get hold of my page again?

(I'd think what I want is just to pause any javascript or other processing from any webpage that us not focused in the browser and not specifically whitelisted.)