In some cases, the RAM actually is in use by the site. That’s especially the case on sites with heavy client-side logic. In that case, it’s not Chrome’s (or Firefox’s) fault, it’s the website’s fault. If you hover over the tab, it should show memory usage in the popover.
Chrome has a “Memory Saver” feature where it’ll unload tabs that are offscreen/hidden which helps quite a bit. Not sure if Firefox has something similar.
In some cases, the RAM actually is in use by the site. That’s especially the case on sites with heavy client-side logic. In that case, it’s not Chrome’s (or Firefox’s) fault, it’s the website’s fault. If you hover over the tab, it should show memory usage in the popover.
Chrome has a “Memory Saver” feature where it’ll unload tabs that are offscreen/hidden which helps quite a bit. Not sure if Firefox has something similar.
Not sure if it’s included in base firefox, but I use a extension that does exactly that