The browser on my Ubuntu Phone (Meizu MX-4, OTA 14) does not open some https-secured sites correctly, such as https://www.amazon.com or https://www.amazon.de. The browser presents a warning about an invalid ssl certificate, although the certificate appears perfectly valid. It then presents the option to go back to a safe site or continue anyway. If I choose continue anyway, it starts to load the site, but never completes. After some time it stops loading and displays a rather incomplete version of the site. It is clearly composed of only some of the pages' elements and incomplete.The amount of the page that is displayed varies from time to time.
It appears that transmission times out while loading the page.
1) Try loading https://www.amazon.com. Observe that webbrowser-app displays warning about invalid certificate, without any apparent reason. Chose "continue anyway". Observe, that the site is only incompletely loaded and unsable.
2) Try loading the web interface of my router: https://rkupper.no-ip.org/. This site uses a self-signed certificate, which is correctly displayed as a security risk. But self-signed certificates are a common use case on DSL or cable routers' web interfaces. Choose "continue anyway". You should see the login page of a fritz box router. Observe that the site is incompletely loaded and the login button does nothing at all.