[tor-bugs] #25806 [Applications/Tor Browser]: When set as default web browser TBB cannot open links clicked in other apps

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#25806: When set as default web browser TBB cannot open links clicked in other apps
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     Reporter:  heyjoe                    |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Major                     |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 On an openSUSE Leap 42.3 system using KDE Plasma:

 STR:

 1. Install torbrowser-launcher and run the Tor Browser
 2. Go to about:preferences and set it as default browser
 3. Click to open an HTTP link from another application (tested with claws-
 mail and newsbeuter)

 EXPECTED
 The link should open in Tor Browser

 ACTUAL
 The link opens in Chromium (the previous default browser). Also
 chrome://settings/defaultBrowser still shows that "Chromium is your
 default browser" regardless of:

 [~]: cat .config/mimeapps.list | grep browser
 x-scheme-handler/http=exo-web-browser.desktop
 x-scheme-handler/https=exo-web-browser.desktop
 x-scheme-handler/http=exo-web-browser.desktop

 As seen on the screenshot
 (https://bugzilla.opensuse.org/attachment.cgi?id=765672) both browsers
 claim to be default simultaneously.

 [~]: find ~ -name exo-web-browser.desktop
 shows nothing

 Additionally I notice that there exist 2 different files:

 ~/.config/mimeapps.list
 ~/.local/share/applications/mimeapps.list


 Further testing:

 4. In System Settings -> Default Applications -> Web Browser set
 explicitly to open http(s) URLs in application torbrowser.
 5. Repeat step 3

 RESULT:

 Now when I click a link (e.g. in claws-mail or in console) Tor Browser
 starts (if it is not started) but does not open the URL. If it was already
 started I simply get a message box:

 "Tor Browser is already running, but is not responding. To open a new
 window, you must first close the existing Tor Browser process, or restart
 your system."

 and the URL still doesn't open in it.

 The TBB version is 7.5.3.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25806>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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