Hi This is on Ubuntu. I installed Firefox Developer edition to /opt/firefox and made a .desktop file I put in ~/.local/share/applications and this was working well. I added it to favourites so it appeared on the dock, and added some customizations. But at some point Firefox started to create its own .desktop file at launch when it prompts to be default browser and you say yes, called stuff like "userapp-Firefox Developer Edition-N8YCQ1.desktop". These files fill up ~/.local/share/applications and break my existing file by making a second Firefox icon on the dock so I cannot click the first one. Also my own custom file had Desktop Actions so I could right-click the icon to open a new window or new private window, but the generated ones are barebones. Every time I delete the "userapp" file, a new one is made the next time I open Firefox (which has now forgotten it is default browser) and the issue is back. Is there an option to disable this behaviour? Thanks for your help