Gmail Divs- How fast do they change?
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Currently developing an extension for Gmail that inserts a couple of buttons, using jquery.

I'm relying on the `canvas_frame`iframe and a couple of more `div` referrenced with their `classnames`, not by their ids. 

How reliable is this? How frequent does Gmail gets their class names changed?

As a side note, I thought of an small javascript file to be pulled from a server constantly, that refreshes `classnames` in case Gmail changes them. I don't like this approach (to change the code) since, this is a security extension, and this will probably request more permissions to the user. 