It might be that FB serves changes to users in one region later than to users in another region, so maybe it'll break for you only after a while. We'll see...

The toolbar buttons are on the left instead of on the right, with the search field underneath them instead of to the left of them.

Sorry, but I can't help - I don't know what's the problem because it works fine for me. Maybe it's some extension or wrong CSS file?

I take it the code above should replace the previous code, not be added to it?

Yes, the code is a complete CSS file.

Another FB CSS update:

._5fo3 {
    display: flex;
}

._2btj {
    flex: 1;
}

An update for FB CSS:

._2t-d, ._2t-e {
    display: flex;
}

._2t-e, ._50tm {
    flex: 1;
}

Does it still work?

Yes, just checked. Did you apply the fix I've mentioned in the subsequent post?

Beside that to get rid of a prompt about upgrading the browser I use:

Strange, I've never got a prompt like that. Have you by chance changed the browser identification option in site preferences for FB?

And to remove a bit of the empty space above the bar on the right side:

I don't have this one too.

I suppose you haven't also got a fix for the typing of comments on YouTube not working properly?

Sorry, no.

Glad I could help.

Yes.

I assume that the double forward slash at the start of the @include line needs to be removed to make the list active?

No, the double slash is needed there. UserJS uses special markers in JS comments.

Just disable opera:config#UserPrefs|AutocompleteOffDisablesWand

I have this one disabled yet Wand still won't work without the User JavaScript.