Blank popup on first use with Heroku/Salesforce

[wvengen]

Describe the issue

When trying to use this app the first time setting up for a Heroku (=Salesforce) account, the popup shown is completely empty:

The browser error console shows:

I have given the necessary permissions in the extension config.

Browser

Firefox

Browser Version

94.0 (64-bit)

Extension Version

v6.3.4

[mymindstorm]

This is because your Firefox is configured to disable the storage.sync APIs, which is nonstandard. Set the configuration value in about:config that the error logs reference to fix this.