Capability matrix

Probed live by bun run capabilities on 2026-09-11.

Extension mode: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36 via chrome.debugger (extension v0.1.0)
Developer mode: Chrome/152.0.7977.83 via direct CDP

CDP domain	Extension mode	Developer mode
Runtime	✅	✅
Log	✅	✅
Network	✅	✅
Page	✅	✅
DOM	✅	✅
CSS	✅	✅
Debugger	✅	✅
DOMDebugger	✅	✅
Input	✅	✅
Emulation	✅	✅
Fetch	✅	✅
Overlay	✅	✅
Accessibility	✅	✅
Audits	✅	✅
Security	❌ code:-32601,message:‘Security.enable’ wasn’t found	✅
Profiler	✅	✅
HeapProfiler	❌ code:-32601,message:‘HeapProfiler.enable’ wasn’t found	✅
Tracing	✅	✅
Performance	✅	✅
Storage	✅	✅
DOMStorage	❌ code:-32601,message:‘DOMStorage.enable’ wasn’t found	✅
IndexedDB	❌ code:-32601,message:‘IndexedDB.enable’ wasn’t found	✅
CacheStorage	✅	✅
ServiceWorker	❌ code:-32601,message:‘ServiceWorker.enable’ wasn’t found	✅
Animation	❌ code:-32601,message:‘Animation.enable’ wasn’t found	✅
Media	❌ code:-32601,message:‘Media.enable’ wasn’t found	✅
WebAudio	✅	✅
WebAuthn	✅	✅
Target	❌ code:-32000,message:Not allowed	✅
Browser	❌ code:-32601,message:‘Browser.getVersion’ wasn’t found	✅

What that means for the tools

Tool	Extension mode	Developer mode
browser_* automation	✅ shared tabs only	✅ every tab
devtools_console, devtools_evaluate, devtools_network, devtools_sources, devtools_debugger, devtools_elements	✅	✅
devtools_storage	✅ cookies via CDP, web storage via page JavaScript	✅
devtools_workers	⚠️ registrations via the page; update/unregister via the page; skipWaiting/start/evaluate need developer mode	✅
devtools_performance (tracing)	✅	✅
devtools_profile (CPU)	✅	✅
devtools_memory (heap)	❌ HeapProfiler not exposed to extensions	✅
devtools_coverage	✅	✅
devtools_emulation	✅	✅
devtools_accessibility, devtools_security	✅	✅
devtools_lighthouse	❌ developer mode only	✅
devtools_cdp (raw commands)	❌ developer mode only	✅
Browser-wide operations (Target, Browser, Storage domains)	❌ not exposed to extensions	✅