* Fission meta {{bug|1451850}}
* [https://bugzilla.mozilla.org/buglist.cgi?classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&f1=cf_fission_milestone&resolution=---&o1=anywordssubstr&query_format=advanced&v1=M4.1%2CM5%2CM6 All bugs blocking Fission Nightly]
= Known Issues =
* Some extensions might not work fully. But please file bugs if you find an extension that doesn't work!
* Cross-site iframes appear empty when printed.
* Cross-site iframes appear empty in screenshots.
* Documents with cross-site iframes cannot enter the BFCache.
* Session history is not tracked for cross-site iframes.
* 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]).
* Linux resource exhaustion issues with large tab counts, including:
** Excessive memory usage
** File descriptor exhaustion issues
** X11 connection exhaustion on Linux ({{bug|1635451}})
= Enabling Fission =
