Deprecation path for NPAPI plugins

[Michael Catanzaro <mcatanzaro igalia com>]

Hi,

Since we're still getting a steady stream of bug reports coming from NPAPI plugins (and the gnome-shell browser plugin in particular), I'd like to try again to deprecate these in Epiphany. My plan is that, in Epiphany 3.30, NPAPI plugins will be disabled by default, and the UI to enable plugins will be removed (both the preferences dialog UI and about:plugins). But the enable-plugins GSetting will stay around, so you can manually enable it if you need to use some legacy plugin.

Then in 2020, say Epiphany 3.38, I'll plan to remove the GSetting. So you have the next two years to work on a migration plan. I believe all browsers have already disabled non-Flash NPAPI plugins, and Adobe support for Flash ends in 2020, so this seems pretty reasonable timeline to me. Comments?

Michael