How to install a html email signature in Gmail on Firefox

Download or save your HTML email signature file to your computer, then open it in your web browser.

With the email signature open in your web browser, press Ctrl + A (⌘ + A for Mac) to highlight the signature, then press Ctrl + C (⌘ + C for Mac) to copy the signature.

Important: Do not use your mouse to select the area, only use Ctrl + A (or ⌘ + A) as you may miss out on grabbing some of the code.

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Login to your Gmail account and navigate to the Settings cog icon at the top right of your screen, then select Settings from the list, and select See All Settings.

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Scroll down the page until you see your Signature settings, then click Create New and enter a new name for your email signature. Click inside the text field to the right of your signature name, then press Ctrl  + V (⌘ + V for Mac) to paste your copied email signature.

Under Signature Defaults, select your new signature for New Emails Use, and On Reply/Forward Use.

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Scroll down and hit Save Changes, then compose a new email and your email signature will automatically insert.

Install the latest version of the Firefox Add-On here. Click Continue to Installation when prompted, then Add.

Open the Email Signature Rescue add-on by clicking the puzzle icon, then selecting Email Signature Rescue.

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Click the Add New Email Signature button to create an install. Select your email client from the dropdown list, then paste your signature key into the next field and click Save Key.

Important: If you're using more than one email account, click Advanced Settings then enter the email address of the account that you want your email signature to work with. This will prevent the signature from being applied to all email accounts.
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Compose a new email and your email signature will automatically insert into your emails.

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