Capability matrix

Probed live by bun run capabilities on 2026-09-16. These results describe the Chromium build below. They do not describe Firefox or Zen; see Firefox and Zen coverage. Run devtools_capabilities with the intended tabId to check another connected browser. A supported domain does not imply that every command is available; Media is left unprobed because its available probes change browser state.

Extension mode: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.36 via chrome.debugger (extension v0.5.0)
Developer mode: Chrome/153.0.8010.48 via direct CDP

CDP domain	Extension mode	Developer mode
Media	— this domain only supports enable/disable	— this domain only supports enable/disable
Runtime	✅	✅
Log	✅	✅
Network	✅	✅
Page	✅	✅
DOM	✅	✅
CSS	✅	✅
Debugger	✅	✅
DOMDebugger	✅	✅
Input	✅	✅
Emulation	✅	✅
Fetch	✅	✅
Overlay	✅	✅
Accessibility	✅	✅
Audits	✅	✅
Security	❌ code:-32601,message:‘Security.setIgnoreCertificateErrors’ wa	✅
Profiler	❌ code:-32601,message:‘Profiler.setSamplingInterval’ wasn’t fo	✅
HeapProfiler	❌ code:-32601,message:‘HeapProfiler.getHeapObjectId’ wasn’t fo	✅
Tracing	✅	✅
Performance	✅	✅
Storage	✅	✅
DOMStorage	❌ code:-32601,message:‘DOMStorage.getDOMStorageItems’ wasn’t f	✅
IndexedDB	❌ code:-32601,message:‘IndexedDB.requestDatabase’ wasn’t found	✅
CacheStorage	✅	✅
ServiceWorker	❌ code:-32601,message:‘ServiceWorker.setForceUpdateOnPageLoad’	✅
Animation	❌ code:-32601,message:‘Animation.getPlaybackRate’ 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	✅

Other extensions (browser_extensions)

Capability	Chromium extension	Firefox / Zen extension
list, info, enable, disable	✅ needs the `management` permission and user consent	✅
uninstall	✅ the browser asks the user to confirm	✅ the browser asks the user to confirm
message (`runtime.sendMessage`)	✅ target must accept Browspark in `externally_connectable`	✅ same rule
open options page	✅	✅
automate the options page	⚠️ only when the user shares options pages; the browser may still refuse the debugger	❌ HTTP(S) pages only
read another extension’s storage	❌	❌
`chrome://extensions`, store and add-on pages	❌ always blocked	❌ always blocked

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