A few days ago, this site reported that Firefox 93 will restore the automatic tab unloading feature, that is, when the system memory is insufficient, the tab will be automatically unloaded. In addition, Mozilla is also preparing a page similar to chrome://discards, and is testing the about:unloads page in the Firefox 94 version.
In fact, as early as Firefox 67 version, Mozilla implemented a memory-saving feature. The company was unable to figure out the low memory conditions on the user’s device, so the feature was withdrawn. When the about:unloads page is accessed in the Firefox address bar, it gives the basic concept of how Firefox prioritizes tabs, and which tabs will be unloaded if tab unloading becomes active. The page also provides an uninstall button to discard a label.
When the user clicks on a discarded label, it will be reloaded again. The table contains 7 columns. Priority, host, last access, basic weight, second weight, memory, and process IDs. When this function is triggered, the priority-based tags will be useless, resources will be released, so that the system memory will return to normal, Firefox will become smooth and responsive again. The process ID is shown in bold in the top frame of the tab, and in italics when the process is shared between different tabs.
This is likely to be similar to the task manager or about:performance page in Firefox. It displays the title, type, energy impact, and memory consumed by the tag. To open TM in Firefox, click Menu> More Tools and select Task Manager. The difference between about:unloads and about:performance is that the former allows you to discard tags on demand, while the latter allows you to kill tags when you find them occupying system memory and CPU.
