Opera 12.11

# Fixes and Stability Enhancements
* General and User Interface
- Several general fixes and stability improvements
* Mac-only
- Fixed a crash related to updating the state of some extensions’ toolbar icons
* Network and Site-Specific
- Fixed several issues related to SPDY
- Gmail: Fixed an issue that could cause Gmail not to load
* Security
- Fixed an issue where HTTP response heap buffer overflow could allow execution of arbitrary code
- Fixed an issue where error pages could be used to guess local file paths