Copy Frame от DaxterSpeed

THIS IS AN EXPERIMENTAL ADD-ON. Support for the ClipboardItem API is required to enable programmatically copying an image to the clipboard, but as of Firefox 88 this API has to be manually enabled by users by visiting about:config and changing the "dom.events.asyncClipboard.clipboardItem" boolean to "true". Changing this setting has an impact on your browser's JavaScript fingerprint.

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Copy Frame adds an option when you open the context menu on videos to let you copy the current frame to your clipboard. The copied frame will be in the video's native resolution.

This is a convenience tool to get clean screenshots from videos without having to crop a screenshot of your browser window or entire desktop, or having to resize your browser to make sure the video element is displayed at the video's native resolution.

Known Issues:
After installing you will have to reload open tabs before the option will work in already opened tabs.
Many sites replace the default context menu on their videos. On some sites, like YouTube, you can open the context menu a second time to get the browser's context menu.