There's no option in the AVG Secured Browser to add extensions. When going to Extensions, as stated above, the only option is to search extensions, of which, there are none because there's no option to add extensions. Even when toggling developer mode on, the only extensions listed are AVG's.
Hi, You can add extensions in Settings>Advanced>Accessibility>Add Accessibility Features>Open Chrome Web Store. You will be warned of the danger if you try to add one that could compromise the security features of the browser. We are here if you need further help.