Ubuntu – How to cache specific web pages for offline viewing

I occassionally need to work offline by accident or design. I'd like to maintain a flexible list of web pages that I can cache for easy offline access.

Notes:

• I'd like to simulate online browsing as closely as possible. So instructions on using "Offline mode" for Chrome/ium (preferable) or Firefox would be best. Or an extension for one of those browsers.
• But, any application will do. For example, I don't use Epiphany but if it's easiest to set up this cache in Epiphany, then Epiphany will become my offline browser 🙂
• Ideally I want to maintain a short list of URLs, and cache them plus every link on them (just 1 link deep will do). I would then maintain the web pages at the root URLs via various web applications. Some of these apps require authentication, so being able to store cookies is also important.
• But, I don't mind having to manually open application X every day to get enter these passwords and store the cache.