Hi, we recommend not to replace css class names and IDs in the page source. But if you have to replace, then follow these steps (example to replace “#ff-stream-1”):
Add following replacement in “replace in html” option under replace tools tab:
#ff-stream-1 ==> #SomeName
Now in the corresponding plugin files, find and replace all occurrences of #ff-stream-1 with
#SomeName