- Rated 1 out of 5by Jani, 4 years agoValidating frames is no longer possible with the new version when using Firefox. Hopefully, the feature will be recovered, otherwise this expansion will be of no use.
Developer responseposted 4 years agoThe same extension works in Chrome. There is a missing feature in FF to have this working. See https://gitlab.com/mgueury/html_validator/issues/11. Feel free to vote for the FF bug.