Please follow the instructions below to install SpyHunter Web Security on this browser:
Navigate to Google’s Chrome Web Store at https://chrome.google.com/webstore/category/extensions
Select the extension and click Add to Chrome. Please follow the instructions below to install SpyHunter Web Security on this browser:
Go to the Settings icon at the top right corner of the browser (the three
horizontal lines beside your profile account). 
Click on the puzzle-like Add-ons icon. 
Type SpyHunter Web Security into the search bar. 
When SpyHunter Web Security appears in the results list, click on the blue
+ Add to Firefox button beside it. Please follow the instructions below to install SpyHunter Web Security on this browser:
Note: If you are using Safari v. 12.0 or higher, together with macOS Mohave or higher, you have to get the extension from the App Store before enabling it in your browser via the “Safari Preferences” menu.
Please follow the instructions below to install SpyHunter Web Security on this browser:
Select the Settings and more icon at the top right corner of the browser
(the three horizontal dots beside your profile account). 
Click on the puzzle-like Extensions icon. 
Click the Get extensions for Microsoft Edge button. 
Type SpyHunter Web Security into the Search bar. 
When the extension appears, click the Get icon beside it to activate it.