Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

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

This thread was archived. Əgər kömək lazımdırsa lütfən yeni sual verin.

Every time Firefox starts, I receive error [JavaScript Application] error: de is null.What is this error?

  • 2 cavab
  • 114 have this problem
  • 7 views
  • Last reply by armanys

armanys
armanys
more options

Every time Firefox starts I received a message:

[JavaScript Application] error: de is null


It may be because I installed few add-ons (including Greasemonkey scripts) or because of Java? I disabled add-ons (most of tem), but to no avail.

Every time Firefox starts I received a message: [JavaScript Application] error: de is null It may be because I installed few add-ons (including Greasemonkey scripts) or because of Java? I disabled add-ons (most of tem), but to no avail.

Chosen solution

Right, the problem was one of extensions installed. Problem solved!

Read this answer in context 👍 25

All Replies (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
armanys
armanys Question owner
more options

Seçilmiş Həll

Right, the problem was one of extensions installed. Problem solved!