Usually when you open an external link the app switches to the default browser, which shows the website. This feels awkward on mobile devices, especially as you have to navigate back to tickers when you’re done with reading.
In the past I had already added the option to use an experimental integrated browser in tickers. This does not switch to the default browser. Instead, the website is shown in tickers. Now, after testing this feature for some time and getting good feedback, it will be the default for all new installations on iOS, Android and Windows 10 Mobile. On Windows 10 for PC, tickers will still open the default browser.
If you prefer the old behaviour, you can easily disable the integrated browser in the options menu.