Raymes:

I figured out why the permission prompt causes those gray placeholders to instantly load. It's here:

https://cs.chromium.org/chromium/src/chrome/browser/plugins/chrome_plugin_service_filter.cc?q=IsPluginAvailable&sq=package:chromium&l=49

Changing the plugin content setting via the Prompt, or via Omnibox Website Settings, causes the plugin list Blink has to be purged, and then plugins to be loaded / (or unloaded!)

This behavior is new to HBD and kind of unexpected.

The patch that introduced it was this: https://codereview.chromium.org/2234133003/

We did this to ensure the plugin list is updated when the page is refreshed. But this was probably too big of a hammer.

Any thoughts on removing this code and somehow only invalidating the Blink plugin list on reload?

Thanks,
Tommy