Enable Hardware Acceleration
- Go to about:preferences
- In General, scroll down to Performance
- Uncheck the box for Use recommended performance settings
- Check the box for Use hardware acceleration when available
Disable Data Collection and Telemetry
- Go to about:preferences
- Go to Privacy & Security, and scroll down to Firefox Data Collection and Use
- Uncheck all boxes in this section
- Restart Firefox
Essential About:Config Tweaks
- Set browser.download.animateNotifications to False
- Set security.dialog_enable_delay to 0
- Set network.prefetch-next to False (Only on slow internet connections)
- Set browser.newtabpage.activity-stream.feeds.telemetry to false
- Set browser.newtabpage.activity-stream.telemetry to false
- Set browser.ping-centre.telemetry to false
- Set toolkit.telemetry.archive.enabled to false
- Set toolkit.telemetry.bhrPing.enabled to false
- Set toolkit.telemetry.enabled to false
- Set toolkit.telemetry.firstShutdownPing.enabled to false
- Set toolkit.telemetry.hybridContent.enabled to false
- Set toolkit.telemetry.newProfilePing.enabled to false
- Set toolkit.telemetry.reportingpolicy.firstRun to false
- Set toolkit.telemetry.shutdownPingSender.enabled to false
- Set toolkit.telemetry.unified to false
- Set toolkit.telemetry.updatePing.enabled to false
Remove Built-in Firefox Add-ons
- In about:config, set reader.parse-on-load.enabled to False
- In about:config, set reader.parse-on-load.force-enabled to False
- In about:config, set browser.pocket.enabled to False
- In about:config, set loop.enabled to False
References
https://www.makeuseof.com/tag/speed-up-firefox-immediately-with-these-6-simple-tweaks/