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Firefox bug: Problem when scroll on popup page of addon

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duplicate of /questions/1211579 thread.

In current version of FireFox, my addon cannot work correctly. When I scroll down to bottom (in popup page of addon), whole content disappears (black space). I don't know exactly the version of Firefox that my addon worked correctly, but I confirmed that it worked correctly. I also try to write new addon, if I don't set css attribute for some element is position:absolute or (fixed), we can scroll down and they works normally, but if I set position:absolute or fixed, it cannot work correctly. You can check this by install this extension: https://addons.mozilla.org/en-US/firefox/addon/smart-emoji-keyboard After that, scroll down to items in bottom, all content will fly away.

duplicate of [/questions/1211579] thread. In current version of FireFox, my addon cannot work correctly. When I scroll down to bottom (in popup page of addon), whole content disappears (black space). I don't know exactly the version of Firefox that my addon worked correctly, but I confirmed that it worked correctly. I also try to write new addon, if I don't set css attribute for some element is position:absolute or (fixed), we can scroll down and they works normally, but if I set position:absolute or fixed, it cannot work correctly. You can check this by install this extension: https://addons.mozilla.org/en-US/firefox/addon/smart-emoji-keyboard After that, scroll down to items in bottom, all content will fly away.

Modified by James