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  1. Click "Open Menu" in the top right corner of the Firefox browser, followed by "Help" and then "Troubleshooting Information"
  2. Copy the absolute directory path for your profile, which can be found next to the "Open Directory" button beside "Profile Directory", and open your profile directory in bash
  3. Make a directory called "chrome" in the directory you just opened
  4. Open gedit or another text editor
  5. Paste the following into the text editor:

    Wiki Markup
     @-moz-document domain({
        div.OutlineContainerDisplayWrapper {
            background-color: white !important;

  6. Save the file as "userContent.css" and close it
  7. In your Firefox browser, paste "about:config" into the URL box and click "Enter"
  8. Where it says "Search Preference Name", search for "toolkit.legacyUserProfileCustomizations.stylesheets"
  9. Click on the word "false", which will toggle it to "true"
  10. Restart Firefox