I recently converted my addon to web-extension, the addon works perfectly for the first page load or full-refresh on all browsers but when navigating to other videos on Youtube the download button is visible only on Opera and Chrome.
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Firefox - https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/
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Chrome - https://chrome.google.com/webstore/detail/video-helper/gjeikcbjolkmbaaoloboeicaghbaflmj
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Opera - https://addons.opera.com/en/extensions/details/easy-youtube-video-downloader-for-opera/
What am I missing here?