I am struggling to use Firefox on my Moto X Pure, running Marshmallow, due to the fact that all links - including visited links (a/k/a vlinks) appear in the same color. I recall some very similar issue back 3+ years ago when I first installed Firefox on my old Galaxy S5, but it was relatively straightforward to solve, so this is not a new issue, but it seems to have become even more poorly documented and supported in the intervening time. My first stop was about:config to change browser.visited_color. That has no effect. My next stop was to documentation on the mozilla ezine, which revealed a few other promising candidates, principally browser.display.use_document_colors. However that isn't anywhere in the off-the-shelf about:config page. The mozilla documentation out there suggests openning the configuration in "editor" mode, by right clicking on an entry and choosing "New". Well, please tell me how to "right click" with an Android touch screen phone. Nope. It doesn't show up with a "touch and hold" pseudo right click... So then I headed over to the Add-on store. The only promising one I could find was called "Remove Document Colors"... but unfortunately it doesn't work. It does create some new entries in the about:config file, but they don't seem to work. There is any entry called "browser.display.document_color_use". Note the slight variation from the object names I found in the mozilla documentation - which is correct? who knows! Because while the "document_color_use" one seems suspect, and it clearly isn't getting the job done, when I manually change the value from 1 to 2 (seriously - isn't this supposed to be a boolean), then suddenly the browser background color starts to override the style sheet, but still the color that i set in browser.visited_color is nowhere to be found. This should be a top priority to document and get a working solution for. A lot of posts are out there about people struggling with this issue, and not one of the so-called solutions provided in those threads seems to be working with the current version of Firefox and/or the current gen of Android. I will add that other third-party browsers all seem to all suffer equally -- all except chrome. Perhaps Google knows something and haven't documented it well to outsiders? Anyway, at this point, what I'm hoping someone can respond with is either (a) how to fix this in android or (b) how to fix in Firefox - specifically for Android.