I have struggled off an on for about a year since getting an M-series Mac with Firefox and memory load. This is an issue that I did not struggle with with the same RAM-Specc'd Intel alternative. I have received multiple out of memory errors the longer Firefox would run. I have done full clean installs of my machine (not restoring anything from backup) and gone so far as to up replacing the machine (though not for this specific issue only) that had double the RAM (32GB vs 16GB). I haven't yet begun to receive out of memory errors on this new machine, but I see the day coming. I believe this is directly related to the number of tabs open, like they must not go to sleep. My concern is that with firefox running, over time (like a day or two) Firefox ends up consuming a little more than 10GB of RAM (peak observed so far). Quitting and reopening Firefox brings me down to 2.5-3 on the same tab count for a couple days. My addons are all up to date, and I only have two (Firefox Multi-Account Containers, and NordPass for password management). I've removed Nord for troubleshooting purposes with no effect. I have changed to various versions and variations of firefox (meaning beta versions and the developer variation of the browser). I have also used another browser entirely (MS Edge) for an extended amount of time with basically the same environment open. For comparison, same tabs, same amount of time open Edge uses 3GB RAM and upon restart jumps to 5GG Ram but settles back down to 3. I am wanting to stay with Firefox. It's multi-container setup is the best there is (that I know of). I hate the idea of moving to another browser. TL;DR '''Issue''': High Memory usage on Apple Silicon (Firefox using just over 10GB RAM after a couple days) '''steps taken:''' Computer has been reinstalled multiple times Computer has been replaced (move from 16GB to 36GB) Browser reinstalled with various versions and variations. Add-ons have been updated and also removed. '''Reference''' Intel Macbook with 16GB RAM in my workflow did not have this issue a single time over many years. '''Desire''' Looking to reign in Firefox's memory usage so I don't have to move to another browser (Edge has proven to hold at 3GB under the same workflow).