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SuperStop is very simple: it adds a Shift+Esc shortcut (configurable) that stops active WebSocket connections, JS timers, XMLHttpRequests, and any animated images, regardless of the state of the Firefox Stop button.
WebExtension rewrite, for Firefox 57 compatibility. Two new features appeared in the process:
* the addon now also stops JS timers (can be turned off)
* the shortcut was made configurable