Clipboard related function not working in Firefox

[shigure32]

After I select copy link / copy text function in Easy Drag, SmartUp asks for clipboard permission, yet the function is not working after Firefox is restarted.

Firefox ver: 71.0 64-bit
System: Windows 10 64-bit
SmartUp ver: latest version in Firefox add-on store

[YandLiu]

You can do following steps to fix it on your own:

1. Download the xpi file from AMO.
2. Unpack it like a zip file.
3. Open folder where you unzip/js/background.js, locate the 1637th line
4. Changedocument.execCommand('copy', false, null); to document.execCommand('copy', false, null);
5. Re-pack, upload and sign it on https://addons.mozilla.org/en-US/developers/