PR Details

Remove animation for firefox when a dialog is opened because it produces an unpleasent flickering effect.

Types of changes

[ ] Docs change / refactoring / dependency upgrade
[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

[x] I have read the CONTRIBUTING document
[x] My code follows the code style of this project
[ ] My change requires a change to the documentation
[ ] I have updated the documentation accordingly (README.md for each UI component)
[ ] I have added tests to cover my changes (at least 1 spec for each UI component with the same coverage as the master branch)
[x] All new and existing tests passed
[x] A new branch needs to be created from master to evolve previous versions
[x] Increase version in package.json following Semantic Versioning
[ ] All UI components must be added into the showcase (at least 1 component with the default settings)
[x] Add the issue into the right project with the proper status (In progress)