| B | ↗ | A | PerformanceContext improved | 
| ⇢ | A | BaseContext::supportsDriver() added | |
| ⇢ | A | BaseContext::doesNotSupportDriver() added | |
| B | ↗ | A | SocialContext::validateFacebookOpenGraphData() improved | 
| B | ↗ | A | PerformanceContext::getResourceUrl() improved | 
| C | ↗ | B | PerformanceContext::getPageResources() improved | 
| B | ↛ | BaseContext::supportsDrivers() removed | |
| A | ↛ | BaseContext::supportsSymfony() removed | |
| A | ↛ | BaseContext::supportsBrowserKitDriver() removed |