Bug 1467130

Created attachment 1293694 [details]
"Applications" section on Firefox showing no magnet entry

Could you please try if the xdg-open opens transmission from command line?
For example:
xdg-open 'magnet:?xt=urn:sha1:6de6a83d402817ef5116d28072f9dd6b0600c6d6&dn=OOo_2.1.0_LinuxIntel_install_en-US.tar.gz&xs=http://mirror.switch.ch/ftp/mirror/OpenOffice/stable/2.1.0/OOo_2.1.0_LinuxIntel_install_en-US.tar.gz'

and what:
xdg-mime query default x-scheme-handler/magnet
says

Jan Horak,

It opened Transmission, but nothing more. It couldn't open the magnet.
Here's the output:

[alquimista@alq14 ~]$ xdg-open 'magnet:?xt=urn:sha1:6de6a83d402817ef5116d28072f9dd6b0600c6d6&dn=OOo_2.1.0_LinuxIntel_install_en-US.tar.gz&xs=http://mirror.switch.ch/ftp/mirror/OpenOffice/stable/2.1.0/OOo_2.1.0_LinuxIntel_install_en-US.tar.gz'
[alquimista@alq14 ~]$ 
(transmission-gtk:4883): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed
** Message: Skipping unknown torrent
"magnet:///?xt=urn:sha1:6de6a83d402817ef5116d28072f9dd6b0600c6d6&dn=OOo_2.1.0_LinuxIntel_install_en-US.tar.gz&xs=http://mirror.switch.ch/ftp/mirror/OpenOffice/stable/2.1.0/OOo_2.1.0_LinuxIntel_install_en-US.tar.gz"


The second command:

[alquimista@alq14 ~]$ xdg-mime query default x-scheme-handler/magnet
transmission-gtk.desktop
[alquimista@alq14 ~]$ 

I'm running 26 now. Clean install.

I just realized the magnet you gave me isn't working, so I tried with another:

[alquimista@alq14 ~]$ xdg-open 'magnet:?xt=urn:btih:c8386c4211bff55f9c191323fed96ce142507732&dn=Steve+Roach+-+New+Life+Dreaming&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Fzer0day.ch%3A1337&tr=udp%3A%2F%2Fopen.demonii.com%3A1337&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Fexodus.desync.com%3A6969'
[alquimista@alq14 ~]$ 
(transmission-gtk:5518): GLib-CRITICAL **: g_file_test: assertion 'filename != NULL' failed

It worked now. Transmission opened, asking me where to save the files.

It started working today, after applying a few updates. Did you fix it?

No actually, I was not able to reproduce it. Please reopen if reoccurs.

Same thing, again. It's so random.

I reinstalled Fedora Workstation 26 on both of my laptops, then I updated the installs and rebooted; and installed Transmission. After that I kept failing to open magnet links on both. Firefox doesn't know what to do with magnets. I don't think there's anything I can tell I did to make it work. Completely random to me.

Any other output I can get?

I'm having the same issue with Firefox 55 and qBittorrent on F26. 

It's been broken for some time. I can't recall if it's worked since the upgrade to F26, but it was definitely working in F25.

I can confirm 

firefox-55.0.2-1.fc26.x86_64

Doesn't matter what bittorrent client. Even manually adding `network.protocol-handler.expose.magnet` which is an oft-cited fix for this doesn't do anything. There is no magnet association.

What actually does work is adding:

"magnet":{"action":4}

inside "schemes":{} 

In ~/.mozilla/firefox/<default_profile>/handlers.json

(be careful it's minified, so I used `python -m json.tool < handlers.json` and output a temporary file to edit by hand first, then copy it over handlers.json (or keep a backup) - firefox will re-minify it upon restarting.)

You can then go into Preferences -> Applications and set the magnet application to your liking.

Not really sure why this is messed up to begin with, though.

This might be related to the https://bugzilla.mozilla.org/show_bug.cgi?id=1297686 I'm working on the support for obtaining list of scheme handlers from GIO, but it will take a while until it will be ready. 

I'm able to reproduce in rawhide, so I'll try to look into it.

I was able to reproduce this with Arch Linux, Ubuntu 17.04 and many other distros with updated Firefox versions. I reported upstream here:

https://bugzilla.mozilla.org/show_bug.cgi?id=1394182

But I couldn't do what they asked me to do.

This is the upstream bug where we actually started debugging it: https://bugzilla.mozilla.org/show_bug.cgi?id=1400803
Please check if disabling e10s helps there, to disable e10s go to about:config
and set browser.tabs.remote.autostart to false.

Magnet links have started working again for me - now on firefox-56.0-4.fc26.x86_64. It may have been fixed in a previous minor version, but I haven't tested opening a magnet link until just now.

Just updated my F26 Workstation and got firefox-56.0-4.fc26.x86_64, but magnet links did NOT start working for me.

Can no longer reproduce with Firefox 58.0.2

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