Firefox Community Forum

Hi, I want to use dark background color theme in the Mozilla Firefox PDF viewer, read here https://support.mozilla.org/en-US/questions/1434510 but cannot find "userContent.css". My question is where can I find this file on a Windows 7 or Windows 10 installation?

When open firefox I have problem , with may sites that appear and I cannot use it. The same problem I have on work and house with mozilla firefox 64bit. I checked my pc with antivirus and for malwares but nothing I have. Please help

Firefox will not open this website (it is my personal photography website.) I'm using Windows 7 64 bit. Seemingly, every other website, but this one will open using Firefox. I have always been able, to use Microsoft's browser, to open this website, except, now, they no longer support W7/64. Thanks, for any help, David Johnson

When I am on espn.com/fantasy team pages everything loads correctly except for one popup table that does not. It will occasionally display but usually doesn't. When it fails to display, the scrollbar disappears but nothing shows. I tried clearing cache and cookies (Ctrl + F5, Settings + Clear data, etc.), refreshing firefox, and disabling all addons/extensions but the problem persists. I also tried turning off hardware acceleration and turned off proxies and secure DNS but nothing worked. I noticed this "_error.js" message in the debugger:

module.exports = __NEXT_REGISTER_PAGE("/_error", function () {

 var e = webpackJsonp(
   [566],
   {
     1789: function (e, r, o) {
       e.exports = o(288)
     },
   },
   [1789],
 )
 return { page: e.default }

})

I do not have this issue on firefox android, only on desktop. Thank you.