I’m on a search kick today, so here’s one for the Mac: Safari has a couple keyboard shortcuts that make it really easy to search all text on the current page and jump to each result. It’s killer for quickly sifting through text-heavy pages and finding keywords or phrases fast.
To toggle the search bar you see at the top of the window in my image (just below the toolbar), use ⌘-F (Edit > Find > Find…). Type whatever you want, and if Safari finds that word or phrase on the current page, it will scroll to the first match and highlight it in yellow (pictured).
Perhaps even more useful: use ⌘-G and ⌘-⇧-G to skip forward and back through every match on the page.