Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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
Open

Developer Tools

Thunderbird Customization
Mapenzi replied
amoun
amoun

Have searched a dozen time for how to enable Development Tools

From the menu, select Developer Tools. An incoming connection prompt will appear.

Important! To allow the developer tools to connect to Thunderbird, you must approve the connection in the prompt. The prompt window may be hidden behind other Thunderbird windows.

So I gather it may not be connecting as there is no prompt.

Ideas if there are any would be appreciated.

AND

I can't edit the first post of a new query, is that the default ??

Have searched a dozen time for how to enable Development Tools ''From the menu, select Developer Tools. An incoming connection prompt will appear. Important! To allow the developer tools to connect to Thunderbird, you must approve the connection in the prompt. The prompt window may be hidden behind other Thunderbird windows.'' So I gather it may not be connecting as there is no prompt. Ideas if there are any would be appreciated. AND I can't edit the first post of a new query, is that the default ??

All Replies (7)

Mapenzi
Mapenzi
  • Topp-25 bidragsyter

In Thunderbird go to menu Tools > Developer Tools > Developer Toolbox... You'll get a popup box prompting to allow the incoming connection (1st image). Click OK to open the Developer Toolbox window (2nd image)

amoun
amoun
  • Topp-25 bidragsyter
Eieren av spørsmålet

Thanks Mapenzi, but a) I'm using Windows and maybe a bit different there.

I can click on Developer Tools, but that is it. The screen does not change.

Thank you again for being here :)

Mapenzi
Mapenzi
  • Topp-25 bidragsyter

Is there no "Developer Toolbox" item in the menu (see image)? I don't see what should be different in the Windows Thunderbird version. Do you use a VPN? Otherwise you'll have to wait that a Windows user is coming by ...

Endret av Mapenzi

amoun
amoun
  • Topp-25 bidragsyter
Eieren av spørsmålet

Hi Mapenzi

No :) No option as in your image

Thanks again for your consideration

Mapenzi
Mapenzi
  • Topp-25 bidragsyter

Your image shows a strange theme which I have never seen in a Thunderbird installation on Windows. Is the Developer Toolbox item also missing when you start Thunderbird in 'troubleshoot mode'?

amoun
amoun
  • Topp-25 bidragsyter
Eieren av spørsmålet

Is the Developer Toolbox item also missing when you start Thunderbird in 'troubleshoot mode'?

Yes

On the 'theme' it is just some formatting I did via userChrome.css

In the 'troubleshoot' mode my css didn't show, a bit concerned, but when starting up as normal all my formatting was back phew!

Anyway UK time here so logging off.

All the best

Endret av amoun

Mapenzi
Mapenzi
  • Topp-25 bidragsyter

No danger, userChrome.css is temporarily disabled in troubleshoot mode. Good night!

Still et spørsmål

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.