DOWNLOAD

FIREFOX 39.0x or later Choose your platform :

  Version
4.0
...
39.0 and later
Windows 0.962 Download HTML Validator for Windows 32 bits X X X
Linux 32 bits 0.962 Download HTML Validator for Linux 32 bits X X X
Linux 64 bits
0.962
Download HTML Validator for Linux 64 bits X
X
X
Mac Os X (universal build)
0.962
Download HTML Validator for Mac OS X X
X
X
Other platforms

Please check the forums



Source code
0.962 Download the source code



FIREFOX 10.0x or later Choose your platform :

  Version
4.0
...
10.0 and later
Windows 0.952 Download HTML Validator for Windows 32 bits X X X
Linux 32 bits 0.952 Download HTML Validator for Linux 32 bits X X X
Linux 64 bits
0.952
Download HTML Validator for Linux 64 bits X
X
X
Mac Os X (universal build)
0.952B
Download HTML Validator for Mac OS X X
X
X
Other platforms

Please check the forums



Source code (2012-01-24)
0.952 Download the source code



Thanks to EclipseChasers2 and Tom for the compilation of the Linux64 and MacOsX versions (see Forums)

FIREFOX 9.0x Choose your platform :

  Version
4.0
...
10.0
Windows 0.951 Download HTML Validator for Windows 32 bits X X X
Linux 32 bits 0.951 Download HTML Validator for Linux 32 bits X X X
Linux 64 bits
0.951
Download HTML Validator for Linux 64 bits X
X
X
Mac Os X (universal build)
0.951 Download HTML Validator for Mac OS X X
X
X
Other platforms

Please check the forums



Source code (2011-12-1)
0.951 Download the source code


FIREFOX 8.0x Choose your platform :

  Version
8.0
Windows
0.912 Download HTML Validator for Windows X
Other platforms

Please check the forums

Source code (2011-09-19)
0.912 Download the source code

FIREFOX 7.0x Choose your platform :

  Version
7.0
Windows
0.911 Download HTML Validator for Windows X


FIREFOX 6.0x Choose your platform :

  Version
6.0
Windows
0.910 Download HTML Validator for Windows X

FIREFOX 4.0x or 5.0.x Choose your platform :

  Version
4.0
5.0
Windows
0.906 Download HTML Validator for Windows X
X

FIREFOX 4.0.x ONLY Choose your platform :

  Version
3.6
4.0
Windows
0.904 Download HTML Validator for Windows
X
Linux 32 bits
0.904 Download HTML Validator for Linux 
X
Linux 64 bits 0.904 Download HTML Validator for Linux 64bits 
X
Mac OsX Intel 32 0.904 Download HTML Validator for MacOS 32bits
X
Mac OSX Intel 64 bits 0.904 Download HTML Validator for MacOS 64bits
X
Mac OSX Intel 32/64 bits (universal build) 0.904 Download HTML Validator for MacOS 32/64bits universal build
X
FreeBSD 7
TODO

OpenBSD 64 bits
TODO

Other platforms
See here

Source code (2010-12-12)
0.904 Download the source code


The extension XPI is now 2.0 Mb big ... The SGML parser is quite complex :-) But seems to work really well. The validation for the biggest pages I saw are below the 1/100 sec for both algorithms.

PREVIOUS VERSION

See here

NEW FEATURES

The new version adds the following new features:
  • Due to Numerous changes due to Firefox 4.0, the extension 0.9 is compatible only with Firefox 4.0
  • The browser icon is in the add-on bar (new name for the status -bar). The add-on bar is hidden by default in FF 4.0.
  • This means too that all platforms binaries will need to be recompiled. Look the source and the forum if you want to help on the migration.
  • To enable HTML 5 validation, it is possible to validate page with W3c Online.
    This works in the page source only to avoid to overload the W3c server.
  • It is possible to use CSE HTML Validator as algorithm if the program is installed. You will need version 10 and later.
For additional questions, there is a forum : http://www.htmlpedia.org/phpBB/

SCREENSHOTS

Screenshot 1: Html Validator 

Notice the Validation after JavaScript execution. And the different icons depending of the algorithm used.

browser

Screenshot 2: Html Validator (validation by Tidy)

tidy

Screenshot 3: Html Validator (validation by SGML Parser)

sp

Screenshot 4/5: The same page validated by validator.w3.org (compare the errors with screenshot 3)

w3 1


w3 2