Five additions, all reading pages you already have open. No new permissions.

A pp calculator on the beatmap page, folded under the SS/99%/95% figures.
Mods, combo, 100s, 50s, misses, accuracy presets. With mods selected it also
rewrites osu!'s own AR, OD, CS, HP, star rating and BPM to what those mods
make them - red for harder, green for easier. Clearing them puts the page
back.

Aim and speed in the stats table, and a graph of where a map is hard with the
hardest passage marked. osu!standard only.

Match cost on multiplayer match pages: the formulas Bathbot, o!TR, osuplus
and Flashlight use, with the tiebreaker and the mod multipliers adjustable,
and warmups marked rather than counted.

Extra filters on the beatmap listing, among osu!'s own. They compose the
search syntax osu! already understands, and read one back.

Bookmarks can be written to a file and read back, merging or replacing.

Also: target pp in the popup, the beatmap id in the copy menu, hit counts
on recent scores.

Two ways to see a replay without the osu! client, both on a score page and
both switchable off.

Watch replay - plays it in the browser through replayviewer.com, in a new
tab or unfolded on the score page itself. The same button sits on the score
rows of a profile: best performance, first place ranks, pinned scores and
most watched replays.

Render via o!rdr - renders it into a video through ordr.issou.best, with
every setting o!rdr takes without an account, and the finished link in the
panel with a one-click copy. The first use asks the browser for permission
to reach o!rdr; the panel says so and where to grant it. Two things worth
knowing: o!rdr lists finished videos publicly, and without an API key it
renders one every five minutes.

Both fetch the replay from osu! with your own session - the same file osu!'s
own download button gives you.

The extension now works on osu.ppy.sh itself, not only in the popup. Everything
below can be switched off individually, behind the gear in the popup.

• Beatconnect and Preview buttons in the beatmapset header, beside osu!direct.
  Preview can also unfold the map in place, without leaving the page.
• pp for an SS, 99% and 95% in the beatmap's stats column.
• Copy the artist or the title without clicking the links and being navigated
  away.
• Bookmark a difficulty straight from the difficulty picker, into the same list
  the popup shows.
• Download and osu!direct on the beatmap rows of a profile - most played, most
  watched replays, pinned scores and best performance - which otherwise offer
  no way to get the map.
• Medals link to osekai, which documents every medal including the secret ones.

Fixed: a bookmark category with a long name hid its own delete button.