You are not likely to find yourself in this situation:

Here's the setup. I've browsed to Brian Donohue's Medium.com essay Bookmarklets are Dead, and I've selected a sentence. Three annotators offer to handle the selection:
- Genius
- Hypothesis (disclosure: my company)
- Medium's built-in annotator
Although you'd have to go out of your way to encounter this clash of annotators, it's a harbinger of things to come. Bookmarklets that activate on demand and inject behavior into Web pages are being superseded by always-on browser extensions. Why? The W3C's Content Security Policy has evolved to favor the latter. Says Donohue: