Responsive Inspector Reloaded allows inspecting page media queries. Same as original, but it works on modern browsers.
Responsive Inspector Reloaded Extension
https://chrome.google.com/webstore/detail/responsive-inspector-beta/memcdolmmnmnleeiodllgpibdjlkbpim
Piotr Walczyszyn (developer) stopped supporting and updating of extension. This version is open sourced and have GitHub project page: https://github.com/MistaTwista/Responsive-Inspector-Reloaded
Feel free to fork and making pull requests or add issues.
Source Manifest.json
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User reviews
Tyeth Gundry (ID: 0000007a4fa702d8) Voted 5 ★ - Updated 07/25/2016
Neil Griffiths (ID: 000000647226d89f) Voted 1 ★ - Updated 04/18/2016
Helio Alves (ID: 000000a51c913b50) Voted 5 ★ - Updated 03/28/2016
Justin Gordon (ID: 000000c943170ad3) Voted 5 ★ - Updated 03/19/2016
Scott Godin (ID: 0000008906dcee40) Voted 5 ★ - Updated 03/15/2016