Preventing Firefox from remembering the input value on refresh with a meta tag

For an input tag there's the attribute autocomplete you can set:

<input type="text" autocomplete="off" />

You can use autocomplete for a form too.

If you want to prevent remembering field values after reload, while still getting to use autocomplete:

First define autocomplete off in the markup:

<input id="the-input" type="text" autocomplete="off" />

Then re-enable autocomplete programatically:

document.getElementById('the-input').autocomplete = 'on';

this will disable autocomplete just at the right time when the page loads and re-enable it so it can be used (but the field value will be empty as it should).

If it does not work for you, try wrapping the js code in a setTimeout or requestAnimationFrame.