FireCws

FireCws compiles web extensions written for Chrome (.crx) into ones usable in Firefox (.xpi).

Why?

One of the Firefox's weak points is that extensions in the world's largest browser extension marketplace, namely the Chrome Web Store, cannot be used. This is the solution.

How?

Install it

npm i firecws #npm
yarn add firecws #yarn
pnpm add firecws #pnpm
bun add firecws #bun

Import it

import * as firecws from 'firecws' // Node/Bun
import * as firecws from 'npm:firecws' // Deno

import * as firecws from 'jsr:@ns/firecws' // JSR(wip)

Use it

Download a .crx extension from the Chrome Web Store:

const extensionId = 'ophjlpahpchlmihnnnihgmmeilfjmjjc' // LINE
const crxExt = await firecws.fromWebStore(extensionId)

Then, compile it to .xpi:

const { xpi } = await firecws.compile(crxExt, {
  // Options
}, progress => {
  // Progress callback
})

xpi // Uint8Array

Extension support table

• 💯 - Working completely
• ✅ - No problems
• ⭕ - Problems, but mostly usable
• 🤔 - Errors occur, inconvenient to use
• ❌ - Can't install

Name	Extension version checked	FireCws version checked	Status
LINE	3.1.2	0.2.0	🤔

Problems

The compilation code is a little bloated and is slow.

Special Thanks

• @EdamAme-x
  • Information on how LINE uses the origin and advice on how to fix it

License

Unless otherwise specified, all files are licensed under the MIT License.

Contributing

Please read CONTRIBUTING.md!