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How can I quickly "unclog" firefox when it runs out of memory (with 1000/2000 tabs)

Hi, Once in a while I try to clean up my tabs. First thing I do is use "merge all windows" to put all tabs into one window.

This often causes a memory clog and firefox get stuck in this state for 10-20 minutes

I have recorded one such instance.

I have tried using the "discard all tabs" addon, unfortunately, it is also getting frozen by the memory clog.

Sometimes I will just reboot my PC as that is faster.

Unfortunately, killing firefox this way, does not save the new tab order, so when I start firefox again, it will have 20+ windows open, which I again, merge all pages and then it clogs again !

So far the only solution I have found is just wait the 20 minutes.

Once the "memory clog" is passed, it runs just fine.

I would like better control over tab discard. and maybe some way of limitting bloat. For instance, I would rather keep a lower number of undiscarded youtube that as they seem to be insanely bloated.

In other cases, for most website I would like to never discard the contents.

In my ideal world, I would like the tabs to get frozen and saved to disk permanently, rather than assuming discard tabs can be reloaded. As if the websites were going to exist forever and discarding a tab is like cleaning a cache.

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  • Sidebery (FOSS, MIT license) has several features that could be used to help you merge thousands of tabs into one window without choking out your memory usage, and generally makes it really easy to organize a massive amount of tabs. It would take several steps. First, you'd right-click the panel (the top-level organizational unit in Sidebery, above the tabs) on each window and select Save to bookmarks (example folder structure: selecting Bookmarks Toolbar/merge/ for a panel named panel1 would save the tabs under Bookmarks Toolbar/merge/panel1; click a folder twice in the selection dialog to expand it). Then you'd close that window and repeat with each window, being careful with the panel names so as not to overwrite any other window's tabs. Once you're down to one window, create an empty panel, right-click it, and select Restore from bookmarks. From this dialog, selecting the top-level folder that all the other bookmarked panels reside in (Bookmarks Toolbar/merge/ in this example) will import every tab from every window that was bookmarked, grouped by the window name.

    When Sidebery imports a panel from bookmarks, the tabs are imported in an unloaded state, so they have basically no effect on memory until you actually click into them and load them. I can restore about 50 tabs per second from bookmarks without my system even slowing down, taking me from 0 to 500 tabs in about 10 seconds. It's not exactly a one-click option, but I wager it will be significantly faster and less prone to completely breaking than your current workflow, and a little easier to back up (even if window/session states get wonky, bookmarks sync pretty much instantly).

    Once your tabs are all in the same window, you can load tabs you want loaded by selecting a bunch (ctrl-click, shift-click, etc., just like in file explorer) and refreshing them, presumably avoiding YouTube tabs (should probably download those with YT-DLP anyway if you want to keep them). Sidebery will actually limit how many tabs it reloads at once, so it'll never choke out your system by trying to instantly load a thousand of them (unlike if you select "open all in tabs" in Firefox's native bookmarks context menu... eurgh). Even if it isn't faster (though I suspect it is) the browser is at least usable while that's going on. I'm not sure how well this method preserves containers, mainly because I don't use them, so if you do, keep an eye on that if you test it out. All I know for sure is Sidebery supports reopening a tab in a new/different container because that's in the default context menu.

    There's more time savings than just window merging and tab loading, there's the tree-style viewing, being able to collapse whole trees of tabs you aren't actively paying attention to, seeing the full titles of 30-40 tabs at a time, no more sideways scrolling, a built in search bar to filter shown tabs by title, fully customizable keyboard shortcuts and context menus... it's actually incredible how much this addon can do, and not only does it have a lot of settings and customization that should let you tailor its behavior to exactly how you want it, you can even sync its actual settings through Firefox! (just make sure to set your device name) Only thing it can't do is remove the tab strip to give you more vertical real estate, but Mozilla might be working on that.

    I know what it's like to be attached to a cumbersome workflow. I hope this can help streamline things for you a bit and make life with ~2,000 tabs just a little less troublesome.

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