This extension provides Speech to Text functionality. Right now you can search by typing text. It's little time-consuming.
How does it work?
You just have to click on salesforce search bar and speak here, you will be redirected to search result as salesforce providing.
After Installing the extension refresh or open new salesforce page, click on the search bar. Then it will ask for permission. Here allow it to Use your microphone.
Speak and Cheers!!