Getting Live HTTP Headers to work with Firefox 4

8 March 2011 by , 11 Comments

UPDATE: The official Live HTTP Headers add-on now works with Firefox 4:

Download Here:

Note this is a temporary solution, and worked for me with Firefox 4 b12:

  • Download the .xpi file (Use right-click save as or Firefox will try to install the add-on)
  • Rename .xpi to .zip
  • Unzip the contents
  • Edit install.rdf
  • Under the <–Firefox –> Section change <em:maxVersion>3.6.*</em:maxVersion> to <em:maxVersion>4.0.*</em:maxVersion>
  • Rezip the files
  • Rename it back to .xpi from .zip
  • In Firefox do file open, and open the .xpi file.

The add-on should install, just restart Firefox and use as normal.

Note: It works on my machine, however your mileage my vary.  Obviously, I recommend that you keep an eye out for an official update and install the proper version as soon as it’s available…

11 Responses to “Getting Live HTTP Headers to work with Firefox 4”

  1. bonkers 11 March 2011 at 12:16 pm #

    Or you could just add the boolean ‘extensions.checkCompatibility.4.0b’ with value ‘false’ in about:config to stop Firefox from checking the minimum required version of an extension 😉

    • luke 11 March 2011 at 12:23 pm #

      Yep that’s certainly the easier way 🙂 Although bear in mind that it will try to run all of your old add-ons rather than just this one (incase you have an add-on that doesn’t play nice with Firefox 4).

  2. Bast 14 March 2011 at 12:10 pm #

    Thanks you two!

  3. Amin 5 April 2011 at 1:56 pm #

    Thank you worked for me.

  4. fengyqf 12 April 2011 at 3:50 pm #

    Very good, Thank you!

    I’ve written a Chinese translation:

  5. shahu 22 April 2011 at 9:31 am #

    Excellent solution.
    Worked for me

  6. Thomas Burtner 27 April 2011 at 6:18 pm #


    today i found a very good german explanation including two download-links for installing live http headers in firefox 4.


  7. elia 11 May 2011 at 6:17 am #

    after install:
    Where is the menu to start the ‘http live header’

    • luke 13 May 2011 at 12:14 pm #

      On OSX it’s in the tools menu

  8. Sylvain 13 May 2011 at 1:02 am #

    The new official version 0.17 of Live HTTP Headers has Firefox 4 support:

    EDIT: Direct link here:

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