This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Why is there a big check mark hovering over the list of my messages in my inbox?

  • 1 freagra
  • 1 leis an bhfadhb seo
  • 3 views
  • Freagra is déanaí ó Matt

more options

See attached image. The checkmark flickers when highlighting messages under it, but it will return as i scroll through the list.

See attached image. The checkmark flickers when highlighting messages under it, but it will return as i scroll through the list.
Attached screenshots

All Replies (1)

more options

Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.