librewolf: dissable adding application for mailto links

about:config
Set: network.protocol-handler.external.mailto to false.

Firefox: disable "Add appliction" notification for outlook and other email portals

1. Open a new tab.
2. Enter about:config instead of an address.
3. Agree to the warning.
4. In the search bar, enter browser.mailto.dualPrompt and set it to true (double click it to toggle). Next time you see the prompt, it will have a second button called Not now. Press it.


From: https://superuser.com/a/1932569/871038

fedora: web-ext keep changes in a profile for testing and use firefox developer edition

web-ext run -f firefox-aurora --keep-profile-changes --firefox-profile=test

distrobox: firefox "Show in Folder" opens vscodium, not thunar or other file manager.

Run in distrobox (make sure thunar is installed in distrobox first):

xdg-mime default thunar.desktop inode/directory
xdg-mime default thunar.desktop x-scheme-handler/file

distrobox: firefox does not open file chooser windows

If you run Firefox inside a Distrobox container on a Gentoo (or any) Linux host, you may notice that the "Save Page As" dialog simply never appears. You hit Ctrl+S, nothing happens. No window, no error, just silence.

The culprit is XDG Desktop Portals. Firefox tries to detect whether it's running inside a sandboxed environment like Flatpak, and when it thinks it is, it hands off file chooser dialogs to the XDG portal service instead of opening a native GTK window. Distrobox leaks enough container-like environment variables to trigger this heuristic, so Firefox dutifully tries to call the portal over D-Bus — but the portal either isn't reachable from inside the container or isn't running at all. The call fails silently and you never see a dialog.

The fix is a single preference change in about:config:
widget.use-xdg-desktop-portal.file-picker = 0
Setting this to 0 tells Firefox to never use the portal for the file picker, falling back to the plain GTK file chooser. The dialog comes back immediately, no restart required.

The default value of 2 means "auto-detect", which is the right call for a real Flatpak sandbox where portals are properly set up. In a Distrobox environment though, the detection fires incorrectly and there's no graceful fallback. Until Distrobox masks the relevant environment variables or Firefox improves its detection logic, flipping this preference manually is the most reliable workaround.

Fix: Firefox in Distrobox "Show in Folder" Opens the Wrong App on Linux

In Distrobox, install thunar if using xfce4 and add inode/directory=thunar.desktop into ~/.config/mimeapps.list: [Default Applications]
inode/directory=thunar.desktop

NixOS: Firefox in distrobox does not use Adwiata theme (no hand mouse cursor)

NixOS injects its Nix store paths into XCURSOR_PATH so the host system finds cursors in /nix/store/..., and distrobox inherits that variable. Inside the Arch container those paths don't exist, so libxcursor found nothing and silently fell back to the default arrow for every cursor change.
vim .config/fish/config.fish
set -e XCURSOR_PATH
set -x XCURSOR_PATH /usr/share/icons ~/.icons


When creating launcher for firefox in xfce4, have to reset `XCURSOR_PATH`:
/run/current-system/sw/bin/distrobox-enter -n abox -- bash -c 'XCURSOR_PATH=/usr/share/icons /usr/lib/firefox/firefox %u '

Firefox crashes when opening through waypipe on Wayland

Run it without GPU:
``` waypipe --no-gpu ssh user@host firefox ```

Firefox open/save window does not show in flatpak

Make sure `xdg-desktop-portal-gtk` service is working and `xdg-desktop-portal-gtk` is disabled: https://reddit.com/r/flatpak/comments/z5nwhz/how_do_i_get_firefox_to_save_downloaded_files/ldwmadz/

firefox: disable webrtc

1. Go to about:config
2. Set peerconnection.enabled to false
3. Check on https://ipleak.net/

firefox socks5 through ssh proxy

ssh -ND 1080 user@proxyserver