Some installation text hereDesktop Installation Install Closet Tools on your laptop or desktop computer. Install In Your Web Browser Use one of the links below to install the web extension: Install the Google Chrome extension if you use Google Chrome. Install the Firefox extension if you use Firefox. Head over to Poshmark.com and log into your Poshmark account. That’s it! It should automatically pop up on the home feed in the lower left corner of the page. For new users, you’ll want to sign up for an account. You can use any email and password that you’d like.