Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

I am having the same slowness, irratic, unstable issues with Thunderbird that I had 9 months ago. T-bird worked fine last sunday but now is unstable,

  • 1 பதிலளி
  • 2 இந்த பிரச்னைகள் உள்ளது
  • 1 view
  • Last reply by sfhowes

Slow to download email, slow to respond or open email, slow or unable to delete email, "A script on this page may be busy....error message when trying to delete an email. I had similar problems before (9 mo ago) but they went away after dealing with McAfee. Thunderbird worked fine last sunday but when I tried to use it today I now have all these problems.

Slow to download email, slow to respond or open email, slow or unable to delete email, "A script on this page may be busy....error message when trying to delete an email. I had similar problems before (9 mo ago) but they went away after dealing with McAfee. Thunderbird worked fine last sunday but when I tried to use it today I now have all these problems.

All Replies (1)

McAfee has been causing problems again this week, so the remedy remains the same:

https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#McAfee