extension: Cleanup plugin-polyfill inline script on Firefox #15958
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The easier half of #15862, which does not apply in other browsers because other browsers don't inject an inline script for this purpose.
This matches Method 2: Inject embedded code (MV2) from https://stackoverflow.com/questions/9515704/access-variables-and-functions-defined-in-page-context-from-an-extension/9517879#9517879