* Working around widely deployed libraries or frameworks that don't support Firefox, have bugs, or make bad assumptions about Gecko, e.g., BrightCove and Ooyola serving HLS over .m3u8 to Firefox for Android on Android 4 (which is not supported) or greater but mp4 to Android 3 (which is supported).
* Relaxing plugin click-to-play restrictions ({{bug|1186948})) on some sites to fix Flash plugin detection.
* Temporarily shim APIs that have been removed until top site is updated (e.g. showModalDialog).