Instead of a password use a key. Private, invisble and cannot be copied and pasted.
Simply head to the place you would like to enter your password, select "Build key" and then "Insert the key". The password remains invisible and free from any copy, pasting and etc. for that one session. Be sure to only use the "Build key" function once if you intend on using the same key to enter the same site/sites as once another key is built it may not be recovered.