Just thought to add my own experiences with Opera Mobile. On both my Xperia M2 (4.4.2) and my Lenovo Tab S8 (4.4.1) the Opera browser crashes on startup without fail and will not allow me to browse any sites what so ever, simply loading into the speed dial causes the app to crash to my home screen. This is with the latest version of the browser from the Google Play Store. Just to note, this is the only app which I have trouble with on either of my android devices.

The browser will run flawlessly for a few days and then this problem occurs, this shouldn't be happening. I have since downloaded the beta version of the Opera browser to see if it is any better, failing that I will just move to an alternative if this issue is not fixed soon.