I recently switched from chrome to firefox and i noticed some strange behavior with some sites. The content if certain elements is just not visible. I managed to solve this for some cases by installing the plugin "Text contrast for dark themes" (https://addons.mozilla.org/de/firefox/addon/text-contrast-for-dark-themes/). Then i noticed that any formula embedded in wikipedia is invisible. After tinkering with the color settings i managed to solve this and thought iam fine. Lately i just noticed that some Bitbucket checkboxes are just not visible (or at least the current check state). I attached a picture of the problem. To clarify, developers have the permission to create repositories. Iam running Ubuntu 16.04 with the Mona 1.0 Unity theme. Regards.