CSP error message shown when extension loads

[ThomasGreiner]

Environment

• Flattr version: 0.7.0.17
• Browser name and version: Firefox 66
• OS name and version: Ubuntu 18.10

Steps to reproduce Install extension.

Observed behavior JavaScript console shows error.

Expected behavior No error is shown in JavaScript console.

Errors

Content Security Policy: The page’s settings blocked the loading of a resource at eval (“script-src”).

Further information This issue can be traced back to Dexie's implementation of Promise which uses new Function("...").