How to Save Website Pages for Offline access in Firefox/...?

I need to save the website of some shops etc Power.fi because you cannot use LTE data in their shops (metallic halls) but I need to compare their prices to their website prices and others. Options of Internet Browsers 1. Firefox because you can install there addons 2. Chrome not because you cannot install addons in Android Chrome 3. ... Options of the goals 1. It would be nice to save daily catalogs of the websites (whole website). 2. And then when time is in need, just take pages which you need (just a page). (Akhil's answer proposal here ) 3. How to Store 777 single pages to one frontend/client/...? Firefox plugins under test - ScrapBook - does not work in Android Firefox because I cannot even install the app in Android; pressing install just goes infinitely but never installs; restoring the page shows that nothing is installed; I did restart the browser but no difference. - ... Chrome (I really would like to find a solution for this as soon as possible Google allows the addons) - ... Phone: Oneplus 2 OS: CyanogenMod 13