Mozilla Thunderbird does not allow me to open links

Question: I have used Mozilla Thunderbird as my email program for the past seven years instead of Outlook because it is free. For the past six months or so, I haven’t been able to activate any of the links I get in my emails when I click on them. I don’t know what to do and am having trouble keeping up with Mozilla’s Thunderbird support. Do you have a solution?

РJames C., S̩bastien

A: Outlook currently offers a free option, which is just a renamed version of the older Microsoft Mail / Live Mail product that came preinstalled with Windows. If you cannot find it on your computer and / or want to download and install the latest version of it, please visit this URL:

That said, Mozilla’s Thunderbird is a good free alternative to Outlook and is generally reliable for everyday messaging use (sending / receiving messages, saving messages to folders, etc.). The support for this is a bit odd, however. Rather than offering direct support over the phone or email, users with problems should browse Mozilla’s fairly large and sometimes intimidating Thunderbird Support Forum available at this URL:

If you cannot easily find an answer to your question on the support forum, then it is suggested that you create an account with Mozilla and post your question publicly on the forum, which (believe it or not) is often very successful. good results. To do this, visit this URL then click on the “Request now” button on the right of the page:

The Thunderbird Support Forum itself hosts a page dedicated exclusively to the issue listed above, which you can find here:

Based on the information on this forum page, the most common cause of this problem is that your version of Windows has somehow lost its default browser designation. This means that when you click on a URL in your email, the Thunderbird program no longer knows where to direct that link (since no default browser has been designated in Windows) and therefore the link does not work when you click on it.

To resolve this problem, you must reset your browser designation to the default on the computer. The steps for the most popular browsers are available at these URLs:

For Chrome:

For Firefox:

For Edge:

If that doesn’t work, it’s likely that the problem was caused by one of three other possible causes:

  1. Another program on the system is blocking the opening of the link and must be removed or changed. This can range from an antivirus to new software that was recently installed but conflicts with Thunderbird.
  2. A newly installed add-on or extension in your default browser is blocking URLs from opening and should be removed or changed or
  3. A setting in Thunderbird is blocking the URL from opening and needs to be changed or updated.

Instructions for working through each of these potential situations can be found at the link mentioned above:

Specifically, look for the instructions found under the captions “Verify that no application is specified for the HTTP content type”, “Verify an incorrect preference”, and “Check for interference from an extension. ”

If the problem persists after this, consider posting your question on the Mozilla Thunderbird Support Forum and waiting for a response from the community. Again, the steps to follow are mentioned above and often results in a high success rate.

Alternatively, if you are tired of using Mozilla and / or want a different option, you can always download, install and configure the free version of Outlook (at the link above) or you can try a different email program. free, such as Mailspring Free, which works very similar to the free version of Outlook. It can be downloaded at this URL:

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