Timimi is a web-extension accompanied by a native host that allows you to save and backup your standalone HTML tiddlywiki files anywhere in your hard-drive. Once installed, you can save the tiddlywiki files without any extra steps, like the original Tiddlyfox addon.
https://ibnishak.github.io/Timimi/
As of version 2.1, Timimi supports the following browsers
It is also reported to work seamlessly in chrome based browsers like Brave and Vivaldi.
Timimi also provides users with 4 backup strategies, viz: