I assume you were being sarcastic? I see it the other way around - the sooner Mozilla gets off the drugs^WGoogle's money the better the chance we get a proper competitor to Chrome.
They were initially Netscape, a commercial company, so they had money from their customers.
After the browser code base was handed over from Netscape/AOL to the Mozilla Foundation in 2003, they got donations from AOL, IBM, Red Hat, etc. which kept them going for a few more years.
The Mozilla Foundation signed the deal with Google two years later, in 2005.
In short, they survived first on commercial revenues and then from donations, neither of which are substantial now.