Bump web-ext from 2.2.2 to 4.0.0
Bump web-ext from 2.2.2 to 4.0.0

Bumps [web-ext](https://github.com/mozilla/web-ext) from 2.2.2 to 4.0.0.
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](https://github.com/mozilla/web-ext/compare/2.2.2...4.0.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sblask/firefox-image-forward,sblask/firefox-image-forward