
Splashtab
Fill the new tab page with a random image from unsplash.com (See description for update)
What is Splashtab?
Splashtab is a Firefox add-on by Swooooooon. This add-on has 25 daily active users, an average user rating of 3.80, and was removed from Firefox Browser Add-ons 3 months ago. The latest version, 1.0.1, was updated 3 years ago.

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Summary
Update April 2023: Some users may notice that the extension fails to fetch images when tags are not used. This is because source.unsplash.com, the URL I use to get images, is no longer supported by Unsplash and I would need to update splashtab to make use of the new API. However, splashtab does not comply with the Unsplash API guidelines* and would thus be ineligable to use the new API in its current form. It is for this reason that I will not be updating the extension. You of course may continue to use it for as long as it remains available and functional, but a time will come when it will break completely and I will unlist it.
Thank you to all of you that that use and rated the extension, and I apologise to all of you for the bad news. There are many other extensions that do similar things, and I would recommend checking out alternatives that are actively maintained. Thanks again.
*https://help.unsplash.com/en/articles/2511257-guideline-replicating-unsplash -- basically the issue is that splashtab would be nothing without Unsplash.
Original description: Fill the new tab page with a random image from unsplash.com. Choose custom tags and resolutions to tailor your preference of images.
GitHub source code: https://github.com/djmalecki/splashtab
User reviews
Safety
Risk impact
Splashtab is relatively safe to use as it requires very minimum permissions.
Risk likelihood
Splashtab may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.