Once you have installed Firefox, go to the Firefox Add-ons site and search for "metamask wallet addins." Once you've found the add-on, click on it and then click on the "Install" button. After the add-on has been installed, you'll need to open it up. To do this, just click on the "metamask" icon located in the top right corner of the Firefox window and then click on the "Wallet" button. After the wallet has been opened, you'll need to create a new account. To do this, just click on the "Create New Account" button and then enter your personal information. After you've completed the account creation process, you'll need to click on the "Create New Wallet" button. This will open up the metamask wallet creation process. To create a new wallet, just enter the address of the wallet that you want to create and then click on the "Create Wallet" button. After the wallet has been created, you'll need to copy the wallet address. To do this, just click on the "Copy Address" button and then paste the address into a text editor. After you've copied the address, you're ready to start trading cryptocurrencies.