Just thought it would be handy to make a list Chrome plugins for debugged GTM (if I missed any please add in comments).

Also if would be useful to survey people on their favorite browser plugins - please add your top5 plugins using comments

(e.g. No1, No3, No2, No7, No9 in comments),

1. Google Tag Assistant (Essential)
https://chrome.google.com/webstore/detail/tag-assistant-by-google/kejbdjndbnbjgmefkgdddjlbokphdefk

2. Google Analytics Debugger (Recommended)
https://chrome.google.com/webstore/detail/google-analytics-debugger/jnkmfdileelhofjcijamephohjechhna

3. WASP (Recommended)
https://chrome.google.com/webstore/detail/wasp-web-analytics-soluti/niaoghengfohplclhbjnjheodgkejpih

4. ObservePoint Tag Debugger
https://chrome.google.com/webstore/detail/observepoint-tag-debugger/daejfbkjipkgidckemjjafiomfeabemo

5. Ghostery
https://chrome.google.com/webstore/detail/ghostery/mlomiejdfkolichcflejclcbmpeaniij

6. Adobe/Omniture Analytics Debugger
https://chrome.google.com/webstore/detail/analytics-debugger/olkcipmnccchnnikelenphfdeigajlcl/details
SiteCatalyst Debugger
https://chrome.google.com/webstore/detail/sitecatalyst-debugger/bdingoflfadhnjohjaplginnpjeclmof

7. Dataslayer
https://chrome.google.com/webstore/detail/dataslayer/ikbablmmjldhamhcldjjigniffkkjgpo

8. DataLayer Inspector (new)
https://chrome.google.com/webstore/detail/datalayer-inspector/kmcbdogdandhihllalknlcjfpdjcleom

9. Tampermonkey Injector for Testing on Live
https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo
https://gist.github.com/tfayyaz/19aa32ae4d5a2dc98a5b

10a. Tag Manager Injector - for Testing on Live
https://chrome.google.com/webstore/detail/tag-manager-injector/ooninanccdmjbcmghimhdfpeklpmlllg/details?hl=en-US

10b. GTM Container Injector - for Testing on Live (source code only)
http://www.conversionworks.co.uk/GTMInjector/Beans%20and%20noses%20-%20public%20edition.pdf
http://www.conversionworks.co.uk/GTMInjector/GTM%20Extension%203.zip

24. Auto-event-listener injector for Testing on Live
https://chrome.google.com/webstore/detail/gtm-auto-event-listener-d/iiihoahkpncaheicjfemhjkkfamcahcd
http://www.simoahava.com/analytics/gtm-auto-event-listener-debugger-v1-1/

11. Code Formatter for GTM
https://chrome.google.com/webstore/detail/code-editor-for-gtm/nolgbicpmekdflgalbbljkplmgabjmdm

12. JSON Formatter
https://chrome.google.com/webstore/detail/json-formatter/bcjindcccaagfpapjjmafapmmgkkhgoa

13. Live HTTP Headers
https://chrome.google.com/webstore/detail/live-http-headers/iaiioopjkcekapmldfgbebdclcnpgnlo

15. Fiddler Headers
https://chrome.google.com/webstore/detail/fiddler/hkknfnifmbannmgkdliadghepbneplka?hl=en

16. Firebug Lite
https://chrome.google.com/webstore/detail/firebug-lite-for-google-c/bmagokdooijbeehmkpknfglimnifench

17. Proxy SwitchySharp
https://chrome.google.com/webstore/detail/proxy-switchysharp/dpplabbmogkhghncfbfdeeokoefdjegm

18. Web Developer Toolbar
https://chrome.google.com/webstore/detail/web-developer/bfbameneiokkgbdmiekhjnmfkcnldhhm

19. Clear Cache & Cookies Button
https://chrome.google.com/webstore/detail/clear-cache/cppjkneekbjaeellbfkmgnhonkkjfpdn

20. User-Agent Switcher
https://chrome.google.com/webstore/detail/user-agent-switcher/lkmofgnohbedopheiphabfhfjgkhfcgf

22. LastPass: Free Password Manager
https://chrome.google.com/webstore/detail/lastpass-free-password-ma/hdokiejnpimakedhajhdlcegeplioahd

23. GTM DevTools Sidebar Panes (added by +Roel Willems)
https://chrome.google.com/webstore/detail/gtm-devtools-sidebar-pane/nlpchkkljkimifenglmblhnklbngejfh

24. InPage plugin for Chrome
https://chrome.google.com/webstore/detail/page-analytics-by-google/fnbdnhhicmebfgdgglcdacdapkcihcoh?hl=en

26. Google Publisher Toolbar
https://chrome.google.com/webstore/detail/google-publisher-toolbar/omioeahgfecgfpfldejlnideemfidnkc?hl=en-US

27. GTM Macro Builder for grabbing the JS location of objects
https://chrome.google.com/webstore/detail/gtm-macro-builder/feeboihdgpananoagfmbohoogoncndba

28. Facebook pixel validator
https://developers.facebook.com/docs/facebook-pixel/pixel-helper

29. Bing Adcentre pixel validator
https://chrome.google.com/webstore/detail/uet-tag-helper-by-bing-ad/naijndjklgmffmpembnkfbcjbognokbf?hl=en
https://www.youtube.com/watch?v=_7FSDATb-mI

More listed here in the App Gallery:
http://www.google.com/analytics/apps/results?category=Widgets%20%26%20Gadgets
https://www.youtube.com/watch?v=bomiwCB-Sio

More plugins here (added by +Stephane Hamel & maintained by +Chris Brinkworth)
http://list.ly/list/AD-inspection-tools-for-measure

------------
[depreciated] 21. GA settings Copy and Paste
https://chrome.google.com/webstore/detail/ga-copy-and-paste/imgngfbfofnhpgdhoejahgpggoclgcom

[depreciated] 25. GTM Tag Folder Organizer (old UI only)
https://chrome.google.com/webstore/detail/gtm-tag-organizer/iiikaoamhkalbgefogkhafpfloplfiim/related?hl=en-US
Shared publiclyView activity