====== Firefox ======

===== Disable Detachable Tabs in Mozilla Firefox =====
  * ''about:config''
  * ''browser.tabs.allowTabDetach''


===== limit memory usage =====

==== cgroups ====

References:
  * [[https://gist.github.com/hrishikeshrt/dab05d42fc60144909cdbde2cc3f4d2c|Limit Memory Usage using cgroups]]
  * [[https://gist.github.com/hardfire/7e5d9e7ce218dcf2f510329c16517331]]
  * [[https://gist.github.com/avoidik/1c7c53f02461f716aabebf3372a6199d]]

But now we have some modern systemd based tools.

==== systemd ====

[[https://wiki.archlinux.org/title/cgroups]]

<file bash /usr/local/bin/firefox>
#!/bin/bash
systemd-run --user -G --scope --unit=run-firefox -p OOMPolicy=continue -p MemoryMaxigh=4G -p MemoryMax=5G -p MemorySwapMax=2G -p "CPUQuota=200%" /usr/bin/firefox "$@"
</file>

or

<file bash /usr/local/bin/firefox>
#!/bin/bash
systemd-run --user -G --scope --unit=run-firefox -p OOMPolicy=continue -p MemoryHigh=50% -p MemoryMax=60% -p MemorySwapMax=2G -p "CPUQuota=200%" /usr/bin/firefox "$@"
</file>

See [[https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#MemoryMax=bytes|MemoryMax]]

Verify limits:
<code bash>
systemctl list-units --user --type scope
systemctl status --user run-firefox.scope

 Memory: 201.3M (max: 2.0G swap max: 2.0G available: 1.8G)
</code>

Modify limits without restarting firefox:
<code bash>
systemctl set-property --user run-firefox.scope MemoryMax=8G MemorySwapMax=10G
</code>

==== firejail ====

<code bash>
sudo apt install firejail

firejail --noprofile --rlimit-as=5g firefox

</code>

<code>
       --rlimit-as=number
              Set the maximum size of the process's virtual memory (address space) in bytes.  Use k(ilobyte), m(egabyte) or g(igabyte) for size suffix (base 1024).
</code>

[[https://wiki.archlinux.org/title/Firejail#Using_Firejail_by_default|Using_Firejail_by_default]]