Zen's userChrome.css to disable rounded corner

[gunir]

First, read this guide but soon Zen'll add more CSS feature to things should become much easier (streamlined) so everyone can do this easily.

userChrome.css

:root:not([inDOMFullscreen="true"]) #tabbrowser-tabbox #tabbrowser-tabpanels .browserSidebarContainer {
  border-radius: unset!important;
  margin: unset!important;
}

:root:not([inDOMFullscreen="true"]) #tabbrowser-tabbox #tabbrowser-tabpanels[zen-split-view="true"] .browserSidebarContainer {
  margin: unset!important;
}

Result:

[mr-cheffy]

Thanks! Ill come back here once I have a theme market place!