If you go to the about:config page you can edit browser.tabs.tabMinWidth down to 50 (default is 76) which lets you fit a bit more
If you want more than that it’s possible by editing the userchrome:
https://old.reddit.com/r/firefox/comments/zda0ov/can_i_get_below_50_tab_width/
Modifying userchrome is admittedly difficult if you’re not a developer… but not out of reach if you’re able to follow a guide.

Damn that setup is no joke. 21GB in a few months initially sounded like a lot to me… but I decided to math it out. Lets say the 20gb was across 1,2 or 3 months…

Time till 1tb would fill up.
+------+-----------+----------+----------+
|      | 3 months  | 2 months | 1 month  |
| 1 TB | ~12 years | ~8 years | ~4 years |
+------+-----------+----------+----------+

That data usage is looking pretty reasonable… Even 20gb per month is something that wouldn’t be too hard to keep up with and I’m sure eventually there’ll be a way to clean up old posts that no one on your instance saved or commented on if you are trying to save space. I’d start to worry if disk usage was hitting closer to 40gb a month.

The blackout was fairly short, although some subreddits did continue it. But the main reason a lot of these subs stopped the blackout was reddit kind of forced their hands to reopen subs. They sent messages to all sub mods saying if any single mod wants to reopen the sub to get in touch with them and they’d basically get the head mod position and be able to take over. They also implied that if subs continue to stay private they’d find someone that is willing to take over moderation responsibilities so the sub could reopen. The solution to this that moderators came up with was to open the subs but purposely sabotage them with ridiculous rules. Preferably ones that would require the sub to become a full time NSFW sub.

Also you seem to be arguing that a blackout is effective but ridiculous sub rules like /r/videos can’t post links to videos isn’t effective. Both are effective. There are a lot of people that are probably trying lemmy because popular subreddits like /r/videos and /r/pics are pretty useless in their current state… they’re effectively as good as private in their current state without actually being private.

Out of curiosity what has the disk usage growth looked like so far for your lemmy instance? I occasionally selfhost but I’m not a hardcore datahorder or anything so the replication of data from instances you subscribe to has me on the fence.

I don’t really like this approach because it’s not personally customizable and wouldn’t be very straightforward. I’d prefer something similar to multireddits where I can make a collection of similar communities.