[whatwg] Proposal for IsSearchProviderInstalled / AddSearchProvider

[timeless]

> This should be rare as annoying and confusing your users typically isn't a
> good business strategy.

Not all strategies involve wanting to keep normal, happy, satisfied customers.

Spammers and other fraudsters seem to be perfectly happy with things
where they capture things like the default search engine of normal
users w/o the users really understanding the consequences.

Oddly, even major companies seem willing to risk the wrath of
customers. Some seem to enjoy tacking on toolbars to other random apps
which make them the default search engine, etc..