DevTools/Fission

DevTools support for cross-site iframes with Fission is in progress and this page summarizes the current state.

Contact

The DevTools team is listening in in the #devtools:mozilla.org room on Mozilla's Matrix server.

Enabling Fission

1. In about:config, set the "fission.autostart"
2. Restart the browser

Reporting Bugs

You can file DevTools Fission related bug in Bugzilla, here.

Resources

• DevTools Testing For Fission Nightly Experiment doc

Fission Compatibility

Panels

Summary of known issues related to DevTools panels.

Accessibility

The Accessibility panel is fully compatible with Fission.

Application

• M3 Service Workers coming from remote frames are not displayed (bug 1473257).

Performance

• M2 New Fission compatible Performance panel will be enabled (by default) at the end of October.

Inspector

• M2 Basic Highlighters (bug 1623667, bug 1572654)
• M3 Less used Highlighters: Grid, shape, path, fonts, geometry, CSS animations (bug 1568827)
• M3 Search (bug 1568880)
• M3 Eydropper (bug 1568831)

Console

• M2 Display messages and evaluate (bug 1663706)

Network

• M2 Display HTTP requests (bug 1663523, bug 1662736)
• M3 Commands: Block, Reload, Resend (bug 1667370, bug 1594726, bug 1594728)

Debugger

• M2 Early breakpoints
• M3 Service workers
• M3 Special breakpoints (DOM, XHR, Event, etc.)

Style Editor

Compatible with Fission, but there is some remaining work.

Storage

• M2 Show data coming from remote frames (bug 1644192)

Memory

• M3 Memory usage of remote frames is not displayed.

DOM

• M3 Objects coming from remote frames are not displayed.

Miscellaneous Features

Screenshot

• Screenshot doesn't work with remote frames (bug 1568833)