You'll want to drop these into:
World of Warcraft/_classic_era_/Interface/AddOns/

!funcdebug

This AddOn is a development addon that adds several buttons to the interface: ReloadUI, Leave Group, and Sound Toggle. Most are around the potrait frame.

ChatFrameTabHide

This AddOn hides all the chatframe tabs and uses the slash command: /cfth

If you're looking for FPS Always, RapidReQueue, or Freemium please download them from Curseforge.

▶ Rapid ReQueue: https://curseforge.com/wow/addons/random-requeue/files

An AddOn that allows you to quickly re-enter the LFG queue and fine a new group. Supports PvP, PvE, Pet Battles.

▶ FPS Always: https://curseforge.com/wow/addons/fps-always/files
An AddOn that always shows the default FPS meter whenever you log in.

▶ Freemium: https://curseforge.com/wow/addons/freemium/files
An AddOn that is meant to get rid of the annoyances and "buy now" ads in game while using a freebie account.