1. However, due to a security issue related to opportunistic encryption, Mozilla disabled the feature in the Firefox 37.0.1 update released April 3.

2. The source of such messages is impossible to verify, as opportunistic criminals often claim membership in gangs to generate fear.

3. He is acting like a responsible adult rather than an opportunistic politician, Berry said.

4. Web browser on March 31, with one of the key new features being a capability known as opportunistic encryption.