Colors:
Green = Action Hook (‘A’ in the label)
Red = Filter Hook (‘F’ in the label)
(anyone who’s not sure about what these are can start their reading in the awesome WP docs here https://codex.www.ads-software.com/Plugin_API)
The hook label will turn dark when there are functions attached to a specific Action or Filter hook, and a small red number will appear in the corner showing how many functions are attached. You can then hover over these darker hook labels to see the names of the function that are attached to them. This is a super useful resource to be able to get this code insight visually, on the fly.
Search:
I have chosen to rely on the browser search (Chrome, FireFox, etc) to quickly find and jump to specific Action or Filter Hook as it’s perfectly suited to this. Anything more might be overkill. (cmd/ctrl + F in Chrome)
Hope this helps.
(Apologies for the very late reply)