It shouldn't autoplayed, but it doesn't look like our picture in picture. It's the feature of this website. Ask its owners, how to disable it.

You can disable PiP via about:config (media.videocontrols.picture-in-picture.enabled = false), but you need a content blocking extension or possibly disable autoplay in Firefox to prevent a website from showing a floating media player window.

You can look at these prefs on the the about:config page to see if these settings work for you to block autoplay and possibly prevent opening a popup player.

• media.autoplay.default = 5 [0:allow;1:blockAudible;2:Prompt;5:blockAll]
• media.autoplay.blocking_policy = 2
• media.autoplay.allow-extension-background-pages = false
• media.autoplay.block-event.enabled = true

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

• https://support.mozilla.org/en-US/kb/block-autoplay

Hi, thanks for your post, unfortunately it did not work. Everything was fine until the most recent update, now PiP is on all the time.

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Hi, thanks - an easy site to access - [https://www.dailymail.co.uk/home/index.htm

Screenshot is PiP.jpg

These are just in-page frames, not Firefox's Picture-in-Picture feature. There's nothing built-in to Firefox to block floating or fixed-position video frames, you would need to use an extension to block them. (I actually haven't researched which extensions can do it.)

Thanks for your help. I have found Pop Up Blocker (Strict) in the add-ons, it seems to have stopped the problem.