Does Google test with just IE and Firefox?

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Ever tried using Google Spreadsheets with something else than IE or Firefox? Yeah, it doesn’t work very well… Docs used to be the same, but at least something is getting better…

However, the issue in Spreadsheets that stops it from working in Opera 9.5 is ridiculously simple! The JavaScript function which tells you they only support IE and Firefox, and asks if you want to continue never returns the value of the confirmation box, so the result is always the same as clicking cancel.

Is Google purprosefully neglecting testing with other browsers, or was this bug left in intentionally?

PS: If you’re an Opera-user, you can grab my UserJS script that fixes Google Spreadsheets in Opera 9.5