* Session restore occasionally fails to restore page state, such as page zoom, scroll offset, or form data.
* DevTools support for cross-site iframes with fission is incomplete ([https://wiki.mozilla.org/DevTools/Fission read more]).
* Attempting to debug extensions or workers from a non-fission window can cause crashes.
* Linux resource exhaustion issues with large tab counts, including:
** Excessive memory usage
=== Disabling Fission ===
[[File:New_non_fission_window3.png|thumb|Opening a new non-fission window]] If you encounter an issue while using Fission, it is possible can be useful to open create a non-fission window within new profile in about:profiles with the same browsing session using the "New Non-default settings (Fission Window" item in will be OFF) and attempt to recreate the hamburger menuissue. This can be useful to determine if issues are Fission-specific, or to work around fission-specific breakage. If you encounter an issue that is fixed in this wayonly happens with Fission, please be sure to file a bug in Bugzilla about it as described above!
To disable Fission, reset the "fission.autostart" pref back to "false" and restart Nightly.
