thanks to librejs and noscript, I could check it first. but it would still be running under someone else's control, so it's hardly distinguishable from any nonfree software. even if it's nominally free software, it's not free for me in that setting. it's like tivoized software.

the key point is that it's coming from, and is thus under control of, someone else's (strangers') servers, rather than from my own.

if it were running under control of my server, then it would be under my control, i.e., it would be free for me.

running under control of someone else's server, it may be free for the server operator, but not for me, so it's not welcome to my computers

CC: @nemobis@mamot.fr @fijxu@noc.social