[waboremo]

If it operates on more than one domain, it needs those permissions to function based on how the permissions system works. You can limit those yourself in the settings page for the extension, but everything else is basically workarounds applied to avoid that permission.

For example, a web clipper operates on multiple domains, but it can avoid it by using activetab permission instead and then offering optional permissions if it wants when you click on the clipper extension icon.

If you want something to be done automatically on multiple domains, this is not possible without that permission. Not unless you want to annoy users with prompts.