FireShot is described as 'Capture full web page screenshots in Firefox, Chrome, Opera, Pale Moon or Internet Explorer
Quick screenshots and annotations!' and is an app in the Web Browsers category. There are more than 100 alternatives to FireShot for a variety of platforms, including Windows, Mac, the Web, Google Chrome and Firefox. The best alternative is ShareX, which is both free and Open Source. Other great apps like FireShot are Greenshot (Freemium, Open Source), LightShot (Free), Snipping Tool (Free) and PicPick (Free Personal).