Especially on a light-resource system, one might want to discover which tab(s) are using a lot of juice.
The following is how I see it.
Right now I’m using what I’d call a Linux crunch box. It’s a computer from around 2017 that can’t run Windows 10 or 11 but can run Linux – specifically, Lubuntu.
With my Windows PC, I commonly have 50 tabs open, sometimes on three different browsers(!), so 150 tabs total. [I am trying to cut down, though.] However, this low-resource crunchbox, whose distro included Firefox (as Linux commonly does, it seems), can’t run more than ten tabs without getting boggy. It depends on the tabs (the sites on the tabs), of course, but when I get to around ten tabs, I follow the “open one then close one” rule.
That said, there are some sites that simply use a lot of computing power, likely because of ads. If I go to one of those sites, this PC’s fan ramps up. I either have to wait until I’m on the Windows PC to visit them, or else close more tabs in Firefox – maybe down to three or four – before visiting one of those high-resource sites.
Some browsers, when you mouse over a tab, it shows that tab’s memory usage. What about Firefox?
To find per-tab memory usage on Firebox, one goes into the application menu (top right, the three horizontal lines), then into More Tools, then Task Manager. You’ll see:)
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