https://connect.mozilla.org/t5/discussions/why-does-firefox-not-have-first-class-support-for-thunderbird/m-p/133476#M53621 <P>When I have Thunderbird installed and I click on a mailto-link, why does Firefox not suggest using that Thunderbird installation as one of the possible ways to handle the link?</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="thanatica_0-1785489900159.png" style="width: 400px;"><img src="https://connect.mozilla.org/t5/image/serverpage/image-id/15322iA03FA1560299278B/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="thanatica_0-1785489900159.png" alt="thanatica_0-1785489900159.png" /></span></P><P>Isn't Thunderbird a Mozilla product? Why isn't it listed? Why do I have to look up its executable?</P><P>Don't make me think!</P><P>Allthewhile, Google and Yahoo are listed, as if I have those&nbsp;<span class="lia-unicode-emoji" title=":expressionless_face:">😑</span></P> Fri, 31 Jul 2026 09:30:29 GMT thanatica 2026-07-31T09:30:29Z https://connect.mozilla.org/t5/discussions/why-does-firefox-not-have-first-class-support-for-thunderbird/m-p/133476#M53621 <P>When I have Thunderbird installed and I click on a mailto-link, why does Firefox not suggest using that Thunderbird installation as one of the possible ways to handle the link?</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="thanatica_0-1785489900159.png" style="width: 400px;"><img src="https://connect.mozilla.org/t5/image/serverpage/image-id/15322iA03FA1560299278B/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="thanatica_0-1785489900159.png" alt="thanatica_0-1785489900159.png" /></span></P><P>Isn't Thunderbird a Mozilla product? Why isn't it listed? Why do I have to look up its executable?</P><P>Don't make me think!</P><P>Allthewhile, Google and Yahoo are listed, as if I have those&nbsp;<span class="lia-unicode-emoji" title=":expressionless_face:">😑</span></P> Fri, 31 Jul 2026 09:30:29 GMT https://connect.mozilla.org/t5/discussions/why-does-firefox-not-have-first-class-support-for-thunderbird/m-p/133476#M53621 thanatica 2026-07-31T09:30:29Z https://connect.mozilla.org/t5/discussions/why-does-firefox-not-have-first-class-support-for-thunderbird/m-p/133703#M53731 <P>That's fixable. Go to TB menu &gt; General &gt; System Integration and click the 'Check Now' button. If it didn't work, post your question at&nbsp;<A href="https://support.mozilla.org/en-US/questions/new/thunderbird/form" target="_blank">https://support.mozilla.org/en-US/questions/new/thunderbird/form</A>.</P><P>&nbsp;</P> Sun, 02 Aug 2026 22:31:10 GMT https://connect.mozilla.org/t5/discussions/why-does-firefox-not-have-first-class-support-for-thunderbird/m-p/133703#M53731 siffemcon 2026-08-02T22:31:10Z