Saving the webpage data directly

I want to get all the objects my browser requested. I tried to use wireshark but most of the traffic is encrypted. Then I tried saving har files but the problem is when I save the har file. and I also save the webpage(in firefox say, I right click on the page and save the page using save as). But I can't match the object exactly with the requests in har file, because in in http request you request with an other name and browser changes it and save with an other name. Please help