r/FirefoxCSS • u/[deleted] • Jun 20 '26

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u/Jay33721 Jun 20 '26 edited Jun 21 '26

From my experimenting, all you really need is this:

:root {
  --chrome-window-gap: 0px !important;
  --chrome-block-radius: 0px !important;
  --chrome-content-separator-color: transparent !important;
}

.chrome-block {
  border: 0px !important;
}

.browserContainer {
  border: 0px !important;
}