Behold: https://www.mechspecs.com/faq/ In there it talks about making sure there is an S in your https MechSpecs, and now Smurfy, utilize an SSL (security feature for websites). Many people were hesitant about donating to MechSpecs because we didn't use an SSL. We have now made our site much more secure and that protects both us, and you. The one side effect is that you can't just paste from Smurfy anymore like you used to be able to. I keep meaning to sit down with him and talk to him about adding an option to cut and paste specifically for MechSpecs LOL
You might be able to add a filter to posts which would replace http://mwo.smurfy-net.de with https://mwo.smurfy-net.de automatically.