Windows 10 will reach 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

Why Thunderbird is not able to update? SOLVED: caused by Avast

  • 5 replies
  • 0 have this problem
  • 6 views
  • Last reply by Roman Roz

more options

Thunderbird has been bugging me every day that it wants to update but is unable to but what does it want to update when I have it up to date?

Thunderbird has been bugging me every day that it wants to update but is unable to but what does it want to update when I have it up to date?
Attached screenshots

Modified by Wayne Mery

Chosen solution

Yes, this is probably reason

Protection → Core shields → Web shield

unchecked Enable QUIC/HTTP3 scanning

looks like solved issue.

Read this answer in context 👍 0

All Replies (5)

more options

When you click download what happens?


Mozila|Abdou

Modified by Mozila|abdou

more options
more options

Mozila|abdou said

When you click download what happens? Mozila|Abdou

I am redirected to page, where I can download and install Thunderbird manually.


christ1 said

See if this helps. https://support.mozilla.org/en-US/questions/1271866

Thanks, it seems Avast something blocked. I unchecked some security settings and waiting for some effect. So far I did not get any pop-ups like in my attachment. Waiting for new release if TB will be able to download and install newest version.

more options

Good find. Avast is known to cause problems

more options

Chosen Solution

Yes, this is probably reason

Protection → Core shields → Web shield

unchecked Enable QUIC/HTTP3 scanning

looks like solved issue.