Html Validator Knowledge Base

Refenerce:

1. https://addons.mozilla.org/en-US/firefox/addon/html-validator
2. Firefox 51.0.1 on Windows 8.1 x64
3. Html Validator 0.9.7.4

Useful links

1. Install a 32-bit firefox may solve the problem Html Validator for Firefox / No library found. last updated 28Jan2017

2. Html Validator for Firefox / No library found http://users.skynet.be/mgueury/mozilla/no_tidy_lib_jsc.html last updated 6/19/2017