Run tests in Firefox

[fregante]

Quite difficult, but I wanted to open an issue to link to my last attempt:

fregante/content-scripts-register-polyfill#58 (comment)

We're here hoping that someone will simplify the process of starting Firefox and loading an extension into it without having to copy-paste puppeteer/puppeteer#5532 (comment) or mozilla/web-ext#1927

[christian-bromann]

Hey @fregante 👋

I solved this using WebdriverIO, using:

const extension = await fs.readFile(path.resolve(__dirname, '..', `runme-firefox-v${pkg.version}.xpi`))
await browser.installAddOn(extension.toString('base64'), true)

My web extension registers a content script that modifies the web app. It has e2e tests set up to validate that the modifications are actually happening. They run with Chrome and Firefox in parallel.