(This screenshot from 駒瑠市〜アクセシビリティ上の問題の体験サイト〜)
It is built with CRXJS Vite Plugin.
To develop extension, lauch the dev server
# Install dependencies
$ npm install
# To testing, load the ./dist directory on your browser
# Currently it doesn't work in Firefox
$ npm run dev
And in your browser, turn on Developer mode, and load the dist
directory with "Load unpacked" button.
# Install dependencies
$ npm install
# Build browser extensions to ./dist (for Chrome) and ./dist-firefox directory
# To testing, load the directories on your browser
$ npm run build
# Build zip files to upload to the stores
$ npm run package