How to set the default browser in KDE?

Question

2021 update: the unexpected behavior described below was actual in KDE Plasma v5.18.5, but isn't actual in 5.22.3 anymore.

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Linux has many ways of "marking" an application "as a default". You can check some of them using following commands:

1. xdg-settings get default-web-browser
2. ls -o /etc/alternatives/*browser*
3. ls -o /usr/bin/*browser* (some of these are symbolic links to the previous list item)
4. xdg-mime query default x-scheme-handler/https
5. grep -E 'https|html' /etc/mailcap
6. If you're on KDE grep BrowserApplication ~/.kde/share/config/kdeglobals

I'm having the exact same issue as in question How do I change the default browser that konsole opens URLs with?.

I'm running KDE 5.13.5. I did following steps:

1. Uninstall Chromium
2. Make sure all items listed above point to Firefox.
3. Go to "System Settings > Applications > Default Applications > Web Browser" (aka $ kcmshell5 componentchooser)
4. Change setting 'Open http and https URLs' to "in an application based on the contents of the URL"
5. Click an https link in Konsole
6. Install Chromium
7. Click an https link in Konsole

Actual result: after step 5, link is opened in Firefox; after step 7—in Chromium.

Expected result: link is opened in Firefox both in step 5 and in step 7.

So KDE decided, that this particular URL (this one) is better suited (see step 4) for Chromium than for Firefox, despite my efforts to mark Firefox as the default browser in six different ways. If in step 4 I choose "in the following application > Firefox", then everything works as expected, but I want to have it set to "in an application based on the contents of the URL".

Which method of marking a browser as default did I miss? How do I convince KDE that this URL is better suited for Firefox, which I tried to mark as my default browser?

P.S. This Debian bugs mail list thread suggests that Konsole does the same as xdg-open <url>, but for me clicking on URL in Konsole opens Chromium, while xdg-open opens Firefox.

Answer 1

If you right-click the link and click "save as" then select it wherever you downloaded it, click "open with" and select firefox. there should be a checkbox saying "Remember application association for all files of type "HTML document" (text/html)"

I'm not sure if this will work in the way you need, but it worked for me