Steps:

• open any website in a tab in Firefox
• open the OBT
• In the OBT's inspector panel, pick an element from the content page
• Right-click on the selected element and choose "screenshot node"

Expected: A screenshot of the selected element is created and downloaded.

Actual: The screenshot does not get created and the following JS error is printed:

Error while calling actor 'screenshot's method 'capture' Screenshot actor failed to find Node actor for 'server4.conn0.child30/domnode2263' Actor.js:91:13
capture@resource://devtools/server/actors/screenshot.js:34:15 handler@resource://devtools/shared/protocol/Actor.js:154:37 onPacket@resource://devtools/server/debugger-server-connection.js:378:58 _onJSONObjectReady/<@resource://devtools/shared/transport/transport.js:464:22 exports.makeInfallible/<@resource://devtools/shared/ThreadSafeDevToolsUtils.js:111:22 exports.makeInfallible/<@resource://devtools/shared/ThreadSafeDevToolsUtils.js:111:22

This does work fine if the selected element belongs to the main browser UI though.

Tracking Fission DevTools bugs for Fission Nightly (M6)

Adding dt-fission whiteboard tag to DevTools bugs that mention Fission or block Fission meta bugs but don't already have a dt-fission whiteboard tag.

Moving these DevTools Fission bugs from Fission's old M6 Nightly milestone to M7 Beta. I am assuming these bugs would have the dt-fission-m2-mvp whiteboard tag if they were Fission Nightly blockers.

Bulk change of all bugs with whiteboard tag of dt-fission to Fission MVP milestone.

Potential duplicate of Bug 1568833

Verified on latest Nightly, works for me.