DOWNLOAD

FIREFOX 23.0x or later Choose your platform :

  Version
4.0
...
23.0 and later
Windows0.958 Download HTML Validator for Windows 32 bits XXX
Linux 32 bits0.958 Download HTML Validator for Linux 32 bits XXX
Linux 64 bits
0.958
Download HTML Validator for Linux 64 bits X
X
X
Mac Os X (universal build)
0.958
Download HTML Validator for Mac OS X X
X
X
Other platforms

Please check the forums



Source code
0.958 Download the source code



FIREFOX 10.0x or later Choose your platform :

  Version
4.0
...
10.0 and later
Windows0.952 Download HTML Validator for Windows 32 bits XXX
Linux 32 bits0.952 Download HTML Validator for Linux 32 bits XXX
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
Windows0.951 Download HTML Validator for Windows 32 bits XXX
Linux 32 bits0.951 Download HTML Validator for Linux 32 bits XXX
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)0.904Download 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