Official browser extensions  

For Chome
https://chrome.google.com/webstore/detail/free-download-manager-chr/ahmpjcflkgiildlgicmcieglgoilbfdp/RK%3D2/RS%3DfQzscgKGm9aMezJJ7Gf2Fcc.JSo-

For Firefox
https://addons.mozilla.org/en-US/firefox/addon/free-download-manager-addon/
