The easiest way to get around that is to just set your own homepage and not use the "default" about:home page. See - How to set the home page

You can use this UserStyle - https://userstyles.org/styles/104673/about-home-hide-snippets-and-hide-brand-logo - to hide the two sections of the about:home homepage that Mozilla sends messages and videos to when they feel the "need".

Many of us have disabled the changes to the top part [brandLogo portion] of the Firefox Start Page and turned off the advertising "snippets" [below the Search container] that Mozilla is using all the time now, so that we don't see that "stuff".

If you feel venturesome, here's how to "fix it". Type about:config in the Location Bar and hit Enter. Accept the "dragons" message to see the advanced prefs screen. Use the Search field at the top to enter the pref mentioned below.

You can set the browser.aboutHomeSnippets.updateUrl pref to an empty string to stop your Firefox from retrieving "snippets" and brandLogo changes. Right-click that pref and select Modify then clear the Value for that pref in the box that appears, then click OK. That will also disable the "snippets" that appear below the Search container on the default homepage.

Then you need to open your Profile folder, via Help > Troubeshooting Information > Profile folder >> Show Folder button. Then close Firefox. With your Profile folder open and Firefox closed ("3-bar" Firefox menu button > Exit/Quit), wait minute or so, then delete the storage\moz-safe-about+home folder in the Firefox profile folder to remove the brandLogo and snippets stored in IndexedDB to make Firefox use the default brandLogo and a default snippet set.

Then restart Firefox for those changes to take effect.

If you should later change your mind about those modifications, you can reset the browser.aboutHomeSnippets.updateUrl pref via the right-click context menu and use Reset to get the default value back to start using the storage\moz-safe-about+home folder again.

Thank you Ed! I will try the venturesome method. Firefox blocked my ability to download the pre-coded fix you offered. I'll let you know how it goes for a non-coding graphicly creative type attempting to fix something in code. It sounds fairly simple if I can locate everything. I used to have to edit postscript files to correct errors, specify attributes and output film and RC paper to a couple of Linotronic imagesetters and a color proofer from Macs and PCs in the middle of the night when there was noone to call for help until the morning and I managed to learn to do that so I feel confident, but I'll let you know if I run into a snag. I appreciate your help!!! -- Chikur

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Chikur said

I am not a web programmer and simply wish that the video that Firefox has overlaid in place of their usual logo on my browser homepage would go away. It appears every time I access the webpage, replacing the simple logo. I do not wish to keep seeing the image in place of the logo. Is there a way I can safely remove the video poster image overlay of two women from my homepage or have Firefox remove it? I haven't watched the video and don't intend to watch it, so there is no point to it being there. I'd like to keep my browser interface very simple and clean. My computer is an older Dell PC running Windows 7 Professional, I believe at 32 bits. Thanks!

Thank you so much Edmeister! While it was slightly scary to go beyond the message that warned that I could void my warranty and should only proceed if I know what I am doing, I trusted that your step-by-step instructions were sound and they worked like a charm! No more video and no more snippets. Just a nice simple Firefox logo and default snippet. I wanted to respond for others' benefit as well and say that the venturesome fix Edmeister offered above works if you follow it step-by-step. It took a moment to find the various things he makes reference to and more complete instructions explaining where to find these things for the less savvy computer user might be helpful, but his instructions were precise and correct. Thank you again!!!