Slack web app login is broken by Privacy Possum

[dan-i-welcome]

If you are reporting a bug, then providing the following is helpful:

• browser name and version
  firefox 126

• privacy possum version
  2019.7.18

If a website is broken, please provide the URL and describe the problem.
the login screen for the Slack web app is broken (white blank)

• https://app.slack.com/signin#/signin
• https://app.slack.com/workspace-signin

If you would like to be extra helpful, and know how to access the Javascript console for the extension, please provide a debug log. The debug log may contain information about your browsing, such as URLS. Please read through it and redact information as you see fit.
"https://a.slack-edge.com/bv1-12/signin-core.7143fc9.primer.min.js" blocked by Privacy Possum

You can access the debug log from the popup console by running popup.debug(), or from the extension's background page by running possum.prettyLog().