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Q405: Tampermonkey seems to run at every page instead of only those where scripts are supposed to run. Why?

A405 Unfortunately Chrome does not allow code injection into frames at the right time. That's why Tampermonkey needs to be injected into every page, because only pre-defined content scripts will be executed at document-start for sure. After the injection, it asks the main application whether to run a script at this URL, and if not, it unloads itself to free all resources. You can help to improve this and tell the Chrome developers how important this feature is for you by starring this and this issue at Chrome's bug tracker.

Just login with you Google Account and click at the star in front of the issue heading. Thanks.