

1 - Ask them if they can either not drop the weights, or if the time this occurs can be adjusted to make it less of a problem. Document that you asked them somehow including date, time, what was said in the request, and how the request was sent.
2 - If nothing can be fixed through step 1 review your condo rules and verify if they are breaching them by doing what they are doing, see what fines are like for each breach of whatever rules is covered by this. If there are no rules for this, you are basically screwed and should either lobby your condo board/property manager for a change in rules or move.
3 - Set up a camera/mic and have your phone handy. Record the noise when it happens noting the date and time.
4 - Submit a complaint to the condo board/property manager every time this happens including the date and time and the recorded evidence, citing which rules are being broken. Be prepared when you start doing this that your neighbor might try to retaliate. If they retaliate by making the noise worse, do the same thing recording it and sending it up the line. If you play music really loud or whatever, they may also try to retaliate by submitting complaints about you - try to not let them catch you out on that.
Eventually, if your property management/condo rules are set up in a reasonable way they would either stop, get evicted by their landlord who is now receiving fines, or be evicted by proxy because the fines are too numerous and expensive. Repeatedly making complaints to your board/property manager usually gets them involved pretty quickly because it creates a constant nuisance they can’t easily ignore.












The minority of Vivaldi is closed source from what I have read actually - specifically the stuff they have that makes its fancy UI work, but someone can correct me with a citation if that is not true.
They state that about 95% of it is available to be read where 92% of that is open source from Chromium, 3% is open source from Vivaldi themselves, and the last 5% that is not available to be read is Vivaldi’s UI.
https://vivaldi.com/blog/technology/why-isnt-vivaldi-browser-open-source/
Still far from open source or free software, but better than most people would think. I guess you would also have to trust them that it really is just the UI.