TiddlyFox

TiddlyFox is an extension for Mozilla Firefox that enables TiddlyWiki documents loaded from a file:/// URI to save changes to themselves.

The latest version of TiddlyFox can be installed from:

https://github.com/TiddlyWiki/TiddlyFox/raw/master/tiddlyfox.xpi

You can also install TiddlyFox from Mozilla's official addon library, but note that this version typically lags behind the latest release.

https://addons.mozilla.org/en-US/firefox/addon/tiddlyfox/