Firefox

Disable “ask AI chatbot” option in right click menu

Set browser.ml.chat.enabled to false.

Disable tab hover preview

Set browser.tabs.hoverPreview.enabled to false.

Keep browser open when closing last tab

Set browser.tabs.closeWindowWithLastTab to false.

Remove Firefox logo from new tab page

Set browser.newtabpage.activity-stream.newtabLayouts.variant-b to false.

Disable URL trimming

Set browser.urlbar.trimURLs to false.

Android: Fix PWA UI issues

With a recent update, opening an installed PWA causes the Firefox app to open first, showing a blank homepage. Also the PWA now has a bar at the bottom, like the normal Android Custom Tabs UI. Previously this bar was hidden, and the PWA took up the full screen.

Revert to the previous behavior by disabling Secret Settings > "Enable Homepage as a New Tab".

You may need to enable the secret settings. Go to About > About Firefox Nightly and tap on the logo until it unlocks.