Where have my health bars gone?

[Ⓐⓝⓞⓣⓗⓔⓡ Ⓥⓘⓞⓛⓐⓣⓘⓞⓝ]

Hello, well - until recently whenever I searched the web, I'd get those green health bars after each result, which varied between green, orange/yellow, and red obviously for sites with a poor reputation - Well - they've gone?? I use avast and firefox mainly, and I am just wondering why they seem to have disappeared.
I really miss seeing those little green bars, they made me feel safe! I did not have a trial for a different antivirus which has expired just in case anyone suggests so.. How can I get it so that they appear again?

Thank you in advance for any helpful replies.