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Showing content from https://support.mozilla.org/en-US/kb/thunderbird-cant-be-opened-after-install-on-mac below:

Thunderbird can't be opened after you install it on a Mac - How to fix

This issue applies to Mac devices only.

Apple has introduced a security change to Mac OS X 10.9.5 which causes the error message "Thunderbird" can't be opened because the identity of the developer cannot be confirmed to appear when you try to install Thunderbird on your Mac.

Here are some steps you can take if you see this message:

1. Hold down the Control key while clicking on the Thunderbird file.
2. Click in the context menu.
3. Click Open in the following dialog window.

1. Click on the Apple icon at the top left corner of your screen and open .
2. Click on , then the tab.
3. You'll see a message stating that Thunderbird was blocked. Click on Open Anyway:

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