This is a basic Firefox extension that replaces the New Tab in Firefox, and displays an image from Flickr Explore, or a Flickr album of your choice.
You can choose the Photoset ID, Flickr Explore, and Photo Sizes in about:addons
> Flickr Photos In New Tab > Preferences.
The Addon page is at: https://addons.mozilla.org/en-GB/firefox/addon/mendhak-flickr-new-tab/
The addon page is at: https://microsoftedge.microsoft.com/addons/detail/flickr-photos-in-new-tab/egfjehkbfaakmjnjkfgkkgpbadngnlff
In Firefox, open up about:debugging
and click 'This Firefox'
Click 'Load Temporary Add-on...' and choose the manifest.json
in this folder.
Zip up all needed files, but exclude git folder:
zip -r -FS ../firefox-mendhak-flickr * --exclude '*.git*'
Then upload to the Developer Hub page and wait for approval.