/* remove maximum/minimum width restriction of sidebar */
#sidebar {
  max-width: none !important;
  min-width: 0px !important;
}











:-moz-any(#bookmarks-view, #historyTree, #editBMPanel_folderTree, #placesList, #placeContent)
treechildren::-moz-tree-row {
  margin-top: -1px !important;
  min-height: 14px !important;
  height: 14px !important;
}


Since version 69 and later, Firefox does not load userChrome.css by default. To make it effective again, open about:config in Firefox and set the preference toolkit.legacyUserProfileCustomizations.stylesheets to true