'''EDIT: Never mind! I ''was'' being dumb! I had to install the extension! ''' From "about:preferences#general" I click "Extensions & Themes" on the bottom left side. This takes me to "about:addons" where it says "Feeling creative? Build your own theme with Firefox Color." at the bottom. I click the second sentence which is a hyperlink that then takes me to "Firefox Color", the website to make your own themes. I made my own theme using the "Custom colors" and "Custom backgrounds" and then saved it using the "Save" button that has a heart above it on the ribbon at the top of the page. This adds it to the "Saved themes" tab on the ribbon that includes (from left to right) "Preset themes", "Custom colors", and "Custom backgrounds". However, when I go back to "about:addons" to apply my theme, it is not there, even after refreshing the page. There is no "Save" (aside from the one that put the theme into the "Saved Themes" tab), "Install", or "Download" buttons on Firefox Color for my theme as far as I can see. So, what am I doing wrong? I'm about 99% sure that I am being big dumb right now and missing something glaringly obvious in this whole process. I appreciate any and all help or advice! Thank you in advance!