feat: npm run firefox:nightly

Runs extension in Firefox Nightly, downloads the latest one if missing.

DEVELOPER-NOTES.md

@@ -91,6 +91,7 @@ Each `npm` task can run separately, but most of the time, `dev-build`, `test`, a
 - `npm run lint:standard`: Run [Standard](http://standardjs.com) linter ([IPFS JavaScript projects default to standard code style](https://github.com/ipfs/community/blob/master/CONTRIBUTING_JS.md))
 - `npm run lint:web-ext`: Run [addons-linter](https://github.com/mozilla/addons-linter) shipped with `web-ext` tool
 - `npm run firefox`: Run as temporary add-on in Firefox
+- `npm run firefox:nightly`: Run as temporary add-on in Firefox Nightly (uses one in `./firefox/`, see `get-firefox-nightly` below)
 - `npm run chromium`: Run as temporary add-on in Chromium
 - `npm run get-firefox-nightly`: Fetch latest Firefox nightly build to `./firefox/`
 - `npm run firefox:beta:add -- --update-link "https://host/path/to/file.xpi" file.xpi`: Add a manifest entry for new self-hosted beta for Firefox

package.json

@@ -53,6 +53,7 @@
     "prepush": "run-s clean build lint test",
     "chromium": "run-s bundle:chromium && web-ext run --target chromium",
     "firefox": "run-s bundle:firefox && web-ext run --url about:debugging",
+    "firefox:nightly": "cross-env PATH=\"./firefox:$PATH\" run-s get-firefox-nightly firefox",
     "firefox:beta:add": "faauv --update ci/firefox/update.json ",
     "get-firefox-nightly": "shx test -e ./firefox/firefox || get-firefox -b nightly -e",
     "changelog": "npx conventional-changelog-cli -p angular -i CHANGELOG.md -s",