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With Summer 15 release Javascript in HTML home page Components is not allowed, but is allowed in VF components/pages included in home page side bar.
When I try to access DOM elements on salesforce page (outside the vf iframe which is hosted on visual.force.com domain) I get cross origin error.
If I enable CORS for visualforce domain (where VF pages are hosted), will I be able access salesforce DOM elements from VF sidebar components using Javascript?
Salesforce has been increasingly locking down the ability to modify standard pages via JavaScript and CSS hacks, because it interferes with their future plans for enhanced user interfaces (for example, see the Lightning Experience feature that was just released). By disallowing sidebar hacks, they've made sure that you can only write code that will be compatible with future technology. While you've not specified your use case, which may well be a valid use case, you'll still need to find another way that fits within the new model to do whatever it is you're trying to do. This may be using a Visualforce page override, a Visualforce or Lightning component, etc. There's a "correct" way to do whatever it is you're trying to do, but you'll need to find out what that way is.
public class AccountListView overrides Account.ListView { public override ListView.Button[] getListViewButtons(ListView.Button[] configuredButtons) { ... } However, I understand it'd be a lot of work for them to do that, but it could be a powerful system.