Firefox

Mozilla's webbrowser.

Configuration

MMB Scrolling

Edit > Preferences > Advanced > General:
  - Use autoscrolling

Override User Agent

On commandline

In configuration

-open:  about:config
  - type: general.useragent.override
  - radio: string
  - click '+' button to create
  - assign windows value: Mozilla/5.0 (Windows NT x.y; Win64; x64; rv:10.0) Gecko/20100101 Firefox/10.0

Addons

Scripted Installation

firefox lets you script addon installs.
this stackoverflow has a suggestion for automating plugin installs.
https://askubuntu.com/questions/73474/how-to-install-firefox-addon-from-command-line-in-scripts

# install-firefox-addon.sh

#!/usr/bin/env bash

EXTENSIONS_SYSTEM='/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/'
EXTENSIONS_USER=`echo ~/.mozilla/firefox/*.default/extensions/`

_get_addon_id_from_xpi () { #path to .xpi file
    addon_id_line=`unzip -p $1 install.rdf | egrep '<em:id>' -m 1`
    addon_id=`echo $addon_id_line | sed "s/.*>\(.*\)<.*/\1/"`
    echo "$addon_id"
}

_get_addon_name_from_xpi () { #path to .xpi file
    addon_name_line=`unzip -p $1 install.rdf | egrep '<em:name>' -m 1`
    addon_name=`echo $addon_name_line | sed "s/.*>\(.*\)<.*/\1/"`
    echo "$addon_name"
}

install_addon () {
    xpi="${PWD}/${1}"
    extensions_path=$2
    new_filename=`_get_addon_id_from_xpi $xpi`.xpi
    new_filepath="${extensions_path}${new_filename}"
    addon_name=`_get_addon_name_from_xpi $xpi`
    if [ -f "$new_filepath" ]; then
        echo "File already exists: $new_filepath"
        echo "Skipping installation for addon $addon_name."
    else
        cp "$xpi" "$new_filepath"
    fi
}

install_addon "$@"

curl https://addons.mozilla.org/firefox/downloads/file/3594392/textern-0.7.xpi
install-firefox-addon.sh textern-0.7.xpi "$USER"

Notes

firefox addon search bookmarks history and tabs	ctrl-p style search of bookmarks
firefox addon keepassxc	integration with keepassxc
firefox addon tridactyl	vim keybindings in firefox
firefox addon dark mode	comprehensive dark stylesheet for websites
firefox addon privacy badger	EFF's adblocker
firefox addon add block plus	popular adblocker

Defunct or without maintainer

firefox addon it's all text	edit textfield in external editor
firefox addon pentadactyl	vim keybindings in firefox (closer to vim than vimperator)
firefox addon vimperator	vim keybindings in firefox