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It stopped working in Firefox. The URL opened in a new tab is "moz-extension://" instead of the image URL. The bug can be easily fixed by replacing the line
GM_openInTab(imgLink);...with
GM_openInTab(imgLink, /*in background:*/ true);Sorry, but this doesn't actually seem to be necessary. Instead, a tab reload is necessary before the opening of a new tab by said code line works with Tampermonkey.