Trying to cope with the seemingly inevitable, I re-wrote my choppr opera extension for Flickr™ in terms of a Chrome(ium) extension.
Choppr is an extension that adds a short flic.kr-url to the right hand column on a Flickr™ photo page.
This short url is calculated from the photo's unique id (actually, the calculation is ”bijective“, thus could be inverted) – there is no web service contacted during that process.
You find the short url behind a little ☆-icon below the photo's license statement and above its privacy information in the right hand info column.
The Chrome version of the extension comes with the added value of showing an icon in the address field, if you are surfing a Flickr™ picture page; a click on that icons copies the shortened flic.kr-url to your clipboard. …
As I'm not willing to pay the $5 entrance-fee for the Google Play store (does Opera plan to keep its own AppStore? – I certainly hope so), I offer the Chrome-Choppr extension here.
You will probably have to configure Chrome to allow installing extensions hosted outside Google Play.