Here are some Chrome browser extensions that are really useful for web developers:
- JSONView
Validate and view JSON documents - PHP Array View
I couldn’t find a PHP array prettifier but if you var_dump a PHP array and inspect it in Chrome, it’s pretty. - PageRank Status
Shows Google PageRank and AlexaRank of current web page, quick access to Geo IP Location, Whois, Alexa, backlinks and indexed pages - Show Title Tag
Shows title in top of the page, since you cant read the title in the small tabs. - Rulers, Guides, Eye Dropper and Color Picker
For UI developers. Pick any color from webpage using eye-dropper tool; display rulers, guides and grid on the page. - Page Ruler
Measure any distance on a page