Recover when cookies are disabled in Firefox and accessing localStorage throws
Instead, catch and ignore this, as though window.localStorage was not defined.
- Set Firefox to "no cookies".
- Loaded any page while logged out.
- Before: JS fatal early in the stack.
- After: page loads and JS works.
Reviewed By: amckinley
Maniphest Tasks: T13216
Differential Revision: https://secure.phabricator.com/D19832