[Arnavion]

>What you are asking for regarding slowing the performance of background JS is something browsers already do

As I wrote:

>>(Yes I'm aware that JS timers, etc operate at reduced frequency for unfocused tabs. I'm talking about stopping them entirely.)

>Making that behaviour more aggressive seems like it is liable to cause significant problems to the user experience with minimal benefits. E.g. background media playback would likely be broken, notifications, etc.

I want none of those things from the "suspended" tabs.

>Whereas you could simply use bookmarks instead of open tabs to get the same effect

How? Do you mean I would load the bookmark into a new tab when I wanted to visit it? That not only has the same problem that I described for discarded tabs (have to wait for a page load), but is even worse because it loses all the context that discarded tabs do retain. Not to mention the annoyance of maintaining bookmarks for arbitrary tab groups that I just happen to have open.