Login with Facebook button issue with Firefox only

Simon,
You look to be using a RokBox, which is just fine. However, what we recommend for using the SCLogin module in any Javascript popups, is to use the "Login Button Type" and set it to "Image". Then, use the "Image Link" parameter to set the image for the Login With Facebook button you'd like to use. You can simply take a picture of the standard Login With Facebook button and use it if you want it to look the same. This is recommended because the Login with FB button is normally very Javascript heavy, and throwing that into a Javascript popup just causes other problems like you've seen.

As for the pre-filled values, we simply use the format/template of the standard Joomla login module. Most users want/expect a direct replacement for the Joomla login module. If you want something more custom, you can create a template override (which will keep your changes after you upgrade) or you can add the {JFBCLogin} tag to a module that's more customized to your tastes.

Finally, for the Javascript way you're doing the pre-filled value, it looks very confusing (to me at least). I'm used to my browser pre-filling the username/password fields for me on many sites, and seeing the **** for the password makes me think it's already done it's job. A better option that most browsers support is the placeholder field on the input. Additionally, I'd recommend using "password" instead of ****.

Hope that helps,
Alex

Simon,
In general, to create a template override for the SCLogin module, it uses the following structure:
/templates/<your_template>/html/mod_sclogin/login.php
Then, anything in the /modules/mod_sclogin/tmpl folder can be copied to that directory above (like the login.php file) and edited there. You can do the same with components as well with a similar structure (though slightly different since components have multiple views).

Please do note though that when you upgrade a module that has a template override, new changes in the module may not take effect since you're using the 'old' template. You should compare your version to the new version and either integrate your changes into the new, or the new changes into your override.

Hope that helps, and good luck!
Alex