Helpful References

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Collection of generally helpful links for extension development.

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Getting started guides
Chrome • Firefox • Safari • Edge • Opera

Extension manifest references
Chrome v3 • Chrome v2 ⚠️ • Firefox • Edge • Opera

Lists of browser APIs
Chrome • Firefox • Opera

Cross-browser compatibility charts
Manifest compatibility • JavaScript API support

Internationalization
Supporting multiple languages • Language locales list

Extension Publishing Guides
Chrome • Edge • Firefox • Opera • Safari

Marketplace Image Guidelines
Chrome • Edge

Marketplace APIs
Chrome Web Store

Other Resources

• Chrome Extension Samples - examples of feature implementations
• Awesome WebExtensions - curated list of resources and tools