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As a first step, at least: Use and contribute to Firefox (or other non-Blink-based browsers, but there aren't many to choose from...), and encourage those you support/influence to do the same.

Only use web technologies supported by the majority of the browsers, not just the majority browser. Basically, use vanilla html5. You can make a perfectly decent website with it. You can play with the shiny (chrome) toys but they should remain curiosities.

Use Firefox. And not only use Firefox, but also promote Firefox. Make sure that all your browser screenshots, presentations, etc show Firefox.

As a developer you, like many of us might be the family tech support. Switch them to firefox.

how exactly is linking to a custom location on a document "stealing the web"?

Use Firefox. Try to convince others to use YouTube. Never use features only available in Chrome/chromium browsers.

Use Firefox, use Safari. Test in Firefox, test in Safari.