I have just noticed an option in Opera browser that lets you tile tabs.....
So...........open Opera..open Kitz Forum and navigate to photograph number 1.
Open new tab and navigate as above to photograph number 2 in the same thread.
Only one tab will display, the other being minimised.
Right click on the "hidden" tab then click on "arrange" and there are the tile options....click on (example) "tile vertically" and the two tabs open side by side in the same window....woohooo..
To get out of the tile arrangement, close one tab and in the remaining tab go to the top right hand corner of the window and click on the normal "maximise" button.