Roman send me an email yesterday about a problem that he researched the other day. He noticed that the mouse cursor in every Firefox tab was disappearing and appearing again with no apparent reason for this behavior. The strange thing was that all tabs were affected, not only one where the webmaster might have played around with Javascript or other scripts. Roman discovered that the disappearing mouse cursor was caused by the Flickr video script.
Users who want to test it can visit the Drupal User Experience website and start playing the first video on the page. They will notice that the cursor will start to disappear for short intervals on all tabs that are open in Firefox. Tests with other web browsers revealed that some show like Opera and Internet Explorer show the same behavior while others like the Google browser Google Chrome seems to be immune and show the cursor all the time.
The problem persists even after stopping the playback of the video in question. One solution is to close the tab that contains the website with the Flickr video which stopped the mouse cursor from disappearing in Firefox. Another solution offered by Roman was to block the Flickr video script with the Firefox add-on NoScript.
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