[2] install this one and turn OFF the default: https://greasyfork.org/scripts/4416-open-links-in-current-ta...; add any sites you want to stay in the same tab to the `include` section (e.g. see [0]). Depending on how you browse, this will be a small list.
You can couple this with a tab-memory addon: example-- set [1]-Tabs to 'sleep' after a certain time; that way they're not using resources but still available later.
AND if you decide you're not gonna read those tabs anyway, just manually close them with having to activate them.
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