I recently found this exact problem. all my HTML files are being detected as application/x-mozilla-bookmarks which I found to be very annoying. Upon further googling I found that it's an upstream bug but there is a fix. http://www.nabble.com/HTML-mimetype-t4651079.html https://bugs.freedesktop.org/show_bug.cgi?id=11843 Reproducible: Always Steps to Reproduce:
Fixed, thanks.