You haven't shared what kind of pages you have loaded in those tabs. If they're 100 simple text pages without javascript bloat or anything, you can blame firefox. If they're 100 pages which ought to be simple but actually have tens of megabytes of complex javascript with memory leaks, you can blame the pages you have loaded. If they're 100 complex desktop-style applications or games, you can blame yourself for trying to do more with your PC than it's specced for.
> If they're 100 pages which ought to be simple but actually have tens of megabytes of complex javascript with memory leaks, you can blame the pages you have loaded.
... but every opinion piece that would fit in 1.5 kb of plain text loads 250 Mb of javascript ...
Yeah, which means the right answer is probably to blame web pages for being bloated, maybe with a little bit of blame for the web technologies for allowing pages to be so bloated.
