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How to Install Add-ons

Add-ons are like apps that you install to add bells & whistles to Postbox. You can get add-ons that add Postbox the MacOS Sharing menu, enable use with Dropbox, Box, and OneDrive, or even add beautifully designed signatures.

Find and install add-ons
  1. Go to the Postbox add-ons page.
  2. Click on the Download link to the right of the add-on you want to install.

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  3. Save the XPI file your computer.
  4. In Postbox, go to the Tools menu and select Add-ons.

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  5. Click the gear icon, and select Install Add-on From File.

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  6. Select the XPI file you downloaded earlier, and click Open.
  7. Click Install Now.

You may need to restart Postbox to enable the add-on.

NOTE: Postbox does not provide support for the functionality of third party add-ons.
Postbox provides a mechanism that allows add-ons from 3rd party developers to be plugged into Postbox. However, Postbox does not provide support for the functionality of third party add-ons, because Postbox did not develop them. Add-on functionality must be supported by the developers of those add-ons. If an add-on isn't working as you expect, or if an add-on is causing problems within Postbox, we recommend contacting the add-on developer directly.

 

Disable an add-on, but keep it installed.

  1. Go to the Tools menu and select Add-ons.
  2. Beside the add-on you'd like to disable select disable.

 

Remove an add-on

  1. Go to the Tools menu and select Add-ons.
  2. Beside the add-on you'd like to disable select remove.

To undo the removal by clicking on undo. This will be available until you close Postbox.

 

Troubleshooting add-ons

Add-ons can change the DNA of Postbox in ways that are incompatible with its default behavior. If Postbox is not operating the way you expect, temporarily disable add-ons to see if the problem clears up for you by using Postbox Safe Mode.

  1. Go to the Help menu and select Troubleshooting
  2. Select Safe Mode, then click Apply and Restart.

For more information, see Starting Postbox in Safe Mode.