Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox 5 works but after installing 6 I get this error when attempting to run it: check details below...

more options

Firefox 5 works fine, but as soon as I install 6 and try to run it, it gives me this error msg:

XML Parsing Error: undefined entity Location: chrome://browser/content/browser.xul Line Number 233, Column 5: <key id="key_scratchpad" keycode="&scratchpad.keycode;" modifiers="shift" ----^ </p>

It also tells me during installation that it cannot find updates for Java and Skype extensions.

Firefox 5 works fine, but as soon as I install 6 and try to run it, it gives me this error msg: XML Parsing Error: undefined entity Location: chrome://browser/content/browser.xul Line Number 233, Column 5: <key id="key_scratchpad" keycode="&scratchpad.keycode;" modifiers="shift" ----^ It also tells me during installation that it cannot find updates for Java and Skype extensions.

Chosen solution

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Extensions that do not have a Remove button in the Extensions Manager are installed by other software and need to be disabled or updated via that software.

You can uninstall and remove Java Console extensions, you do not need them to run Java applets.

See:

Read this answer in context 👍 0

All Replies (4)

more options

Start Firefox in Use Troubleshoot Mode in Firefox to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

more options

It's not the hardware acceleration or the theme, so it must be an extension.

I've worked through the extensions now and it tells me the skype and java console extensions are incompatible with firefox 6, but I don't have remove options for them. How should I proceed?

Modified by flangenimblick

more options

Chosen Solution

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Extensions that do not have a Remove button in the Extensions Manager are installed by other software and need to be disabled or updated via that software.

You can uninstall and remove Java Console extensions, you do not need them to run Java applets.

See:

more options

Seems to be working now!


Ok, so I went into my extensions folder directly and deleted the Java and Skype extensions but I was still getting a similar error.

I then started firefox in safemode and went through the extensions one by one and non of them seemed to be causing the error.

I re-downloaded the firefox 6 installer and reinstalled and it seems to be working now! So, yay!