Get the marklet extension for Firefox
The marklet extension is the fastest way to add new websites to your marklet account. When you're browsing the web and come across a site you'd like to add to marklet, simply click the marklet button, select a category, and it will automatically be added to your account!
After clicking the button above, click Allow at the security prompt. It will look like this:
You will then be promoted to install the extension. Click Install Now:
Once installed, Firefox will prompt you to restart. Click Restart Now:
When your browser restarts, you'll see the m button in the top right of your browser.