The add-on could not be downloaded because of a connection error (Firefox)

[angelhair0]

Please read the CONTRIBUTING guide before submitting an issue.

Description

When installing for Firefox, the extension downloads fully, and upon installation an Firefox error says "The add-on could not be downloaded because of a connection error"

Expected Behavior

I expected the extension to successfully install, as the previous version successfully installed.

Actual Behavior

Error after download/during install

Steps to Reproduce

1. Download xpi or zip/open zip
2. Run installer
3. Error

Versions

• Browser: Firefox 76.0.1
• OS: Mac 10.14.6
• Node: ?
• NPM: ?

[christophertino]

If you're attempting to load a Ghostery build from a GitHub release, you'll need to load it as a temporary add-on with about:debugging. Otherwise you have to install from the Firefox store.