As Christian noted, I would suggest to use Cordova InAppBrowser plugin - this plugin is used for opening web browser from a Cordova app. Here is more information on adding Cordova Core plugins to your hybrid project.
You may review the InAppBrowser sample app here.
In general in a Hybrid app you have a starting/main index.html and when you navigate to different views, the same index.html gets different DOM elements added/hidden and thus different views are shown/removed. Thus a Hybrid app is similar to a single-page application - you navigate through the different DOM elements of that page and not through different pages.
All app logic is saved in window.app object which is connected to the main index.html. Therefore, when you navigate to a different .html page using window.location for example, all data and methods are lost (window.app object is lost as well as all methods and data saved, as if the application is closed). For the above reason you may consider using Cordova InAppBrowser plugin for opening external resources inside a Hybrid app.
I hope this has helped.
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