Using the extension in Mozilla Firefox
After installing the Hyperlink5 extension in Mozilla Firefox, some users have been surprised that the toolbar icon did not appear to show up in the browser. There’s a simple explanation: Mozilla is designed to add all extensions to the “Add On” bar, which may be hidden by default, or placed at the bottom edge of the browser:
Fortunately, there’s a solution. If you don’t see the Add On bar, right-click anywhere on the top toolbar and make sure there is a check next to “Add-on Bar”.
Once you see the Add-on bar, once again right-click and select “Customize”. When the the customize window is open you can drag the Hyperlink5 icon from the Add On bar to the regular toolbar (next to the Home icon, for example). You can then remove the Add on bar if you wish.