[joseluis]

I'm in a very similar situation as you are regarding my browser usage and needs. I now have 46 windows open and 2.1K tabs open, but I've had at some point almost 70 windows and more than 7K tabs...

The most useful extensions I've found to manage this complexity are https://github.com/tpamula/webextension-window-titler and https://github.com/l10nelw/winger.

This is the script I made to bring up the firefox window I desire from the custom name I gave it using window-titler:

    #!/usr/bin/env bash
    #
    # switches to the firefox window that starts with the provided word between brackets
    
    NAME=$1
    
    WIN=$(wmctrl -l | grep Firefox | grep "\[${NAME}")
    if [[ -z $WIN ]]; then
        echo "no window found"
        exit
    fi
    
    NUM_WINS=$(echo "$WIN" | wc -l)
    if [[ $NUM_WINS -ne "1" ]]; then
        echo -e "$NUM_WINS windows found, please be more specific:\n"
        for w in "$WIN"; do
            echo "$w" | cut -d' ' -f4-
        done
        exit
    fi
    
    WIN_NAME=$(echo $WIN | cut -d' ' -f4-)
    WIN_ID=$(echo $WIN | cut -d' ' -f1)
    
    echo opening: $WIN_NAME
    wmctrl -iR $WIN_ID

And winger allows me to stash not-currently-needed windows in bookmarks, and restore them later...

This is a less than perfect system, but it's good enough for me for now.