If you’re looking for specific episodes in the index, here are the heavy hitters: The Pilot (The One Where Monica Gets a Roommate)
Likely the most comprehensive index. You can find Season 1 subtitles in dozens of languages, from Arabic to Vietnamese. index of friends season 1 subtitles
The most common frustration is "subtitle lag"—where the text doesn't match the audio. When browsing an index, look for the in the filename. If you’re looking for specific episodes in the