Greasy Fork is available in English.
Adds: sidebar toggle bar (click on blue vertical separator bar), auto collapsing sticky floating table of contents at top left (hover mouse on it to expand), collapsible sections (click section title to toggle), section links (for getting URL to page sections), auto popup sticky table headers (when table height is longer than the screen), table manipulations (double click empty space of a table cell to show menu).
For old Wikipedia layout only.
