Emacs and Firefox on Debian

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I have once again switched browsers, the pendulum is now on the Firefox side. However when I changed my Emacs config to open links in firefox it didn’t work.

Instead I got the error message “Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.”

It turned out that I had both the firefox and firefox-esr packages installed, and browse-url-firefox tried to open iceweasel instead of firefox. Uninstalling firefox-esr solved it.