The phrases “default block” and “no longer active by default” refer to things that look, in general, like the last message you contacted. Also, users will not be able to use NPAPI plugins. They will require users to explicitly approve the creation of instances of NPAPI plugins.
However, the Chromium blog also says: "In the end, however, NPAPI support will be completely removed from Chrome." When this happens, it will be impossible to load NPAPI plugins in Chrome.
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