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Complete Firefox Migration Guide: From Snap to Debian APT .deb (Ubuntu)

Restore Firefox’s stability and performance on Ubuntu by switching from the Snap package to Mozilla’s official .deb to overcome configuration caveats and recent Firefox Snap issues.

Motivation:

While using Firefox, numerous
apparmor="DENIED" profile="snap.firefox.firefox" name="/proc/pressure/memory" comm="MemoryPoller"
messages flooded the syslog, making log analysis impossible.

See also

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There instructions were first published in debian forum, here http://forums.debian.net/viewtopic.php?f=16&t=73497 but I added them here for easier access

Add policykit file

• Add XML file on the path /usr/share/polkit-1/actions/org.freedesktop.policykit.pkexec.policy with the following content:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
<policyconfig>
    <action id="org.freedesktop.policykit.pkexec.run-synaptic">

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# file /etc/environment
CLUTTER_VBLANK=none

# max performance command
nvidia-settings -a [gpu:0]/GPUPowerMizerMode=1 > /dev/null

# fix tearing command
nvidia-settings --assign CurrentMetaMode="nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }"

# multiple monitors example

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{ "city" : "Beograd", "_id" : 11000 }
{ "city" : "Beograd Vozdovac", "_id" : 11010 }
{ "city" : "Beograd Čukarica", "_id" : 11030 }
{ "city" : "Beograd Zvezdara", "_id" : 11050 }
{ "city" : "Beograd Palilula", "_id" : 11060 }
{ "city" : "Novi Beograd", "_id" : 11070 }
{ "city" : "Beograd Zemun", "_id" : 11080 }
{ "city" : "Beograd Rakovica", "_id" : 11090 }
{ "city" : "Kaluđerica", "_id" : 11130 }
{ "city" : "Rušanj", "_id" : 11194 }