Persona site doesn't detect when Safari is in Private Browsing mode

[jaredhirsch]

Extracted from discussion in #3094. If Safari is in Private Browsing mode, it'll throw when we touch localstorage. We should detect and bail before letting the user enter an email address.

Using Safari in private browsing mode:

1. go to https://login.persona.org
2. entering an email click submit

results in loading this:
https://login.persona.org/signin? with no other visual indication that anything changed. The user has no idea what happened.

The console reports "QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to add something to storage that exceeded the quota."

This should also

[edwindotcom]

@ozten I'm thinking you have a change that we staged related this...

[callahad]

Hi! To help us better focus, I'm "closing" all issues that have been open for more than six months. These have been tagged "cleanup-2014" so that we can go back and review them in the future.

For more information, check out this thread: http://thread.gmane.org/gmane.comp.mozilla.identity.devel/7394

If you believe this bug is still a major issue for you, please comment, submit a pull request, or discuss it on our mailing list: https://lists.mozilla.org/listinfo/dev-identity

Sorry for GitHub notification spam!

[jaredhirsch]

Reopening, still an issue, see https://bugzilla.mozilla.org/show_bug.cgi?id=1115216 for the latest dupe.