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Extension in a default-src 'self' CSP environment causes page load to fail #1519

Description

@robinwhittleton

Intended outcome:

Load a page with a CSP of default-src 'self'; (in this case https://standardebooks.org/). The page is expected to load and render regardless of the CSP settings.

Actual outcome:

Blank screen, and CSP errors in the console. This was originally reported at standardebooks/web#397.

How to reproduce the issue:

Visit https://standardebooks.org/, observe blank page, observe errors in the console.

Desktop (please complete the following information):

  • OS: [e.g. iOS] macOS 14.6.1
  • Browser [e.g. chrome, safari] Firefox
  • Browser version [e.g. 22] I tested in Nightly
  • Extension version [e.g. 3.0] 4.18.6

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