SYNCH 
  xmarks/firefox [same] comm...box @ gmail

# Command Line Options   https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options
# The `about:` Protocol  https://developer.mozilla.org/en-US/Firefox/The_about_protocol

# Find CSS selector names [id or class] for userChrome.css @ \Profiles\{profile}\xulstore.json

# Modify Bookmarks Menu using CSS [userChrome.css]

	- hide "...Pocket..." :: about:config > 
	
		> extensions.pocket.enabled
				TOGGLE to 'false'

	- hide "..." menu elements :: about:config > 

		> browser.uiCustomization.state  [UNtested]
		> browser.pageActions.persistedActions  [Tested;NO CHANGE]
				{"version":1,"ids":["bookmark","bookmarkSeparator","copyURL","emailLink","sendToDevice","screenshots"],"idsInUrlbar":[]}
		> extensions.webextensions.themes.icons.buttons  [Tested;NO CHANGE]
				back,forward,reload,stop,bookmark_star,bookmark_menu,downloads,home,app_menu,cut,copy,paste,new_window,new_private_window,save_page,print,history,full_screen,find,options,addons,developer,synced_tabs,open_file,sidebars,share_page,subscribe,text_encoding,email_link,forget,pocket

  - hide 'Mobile Bookmarks', 'Bookmarks Toolbar', back-button, forward-button

		1. Create '\chrome' folder and 'userChrome.css' file under %AppData% ...
		
			@ \AppData\Roaming\Mozilla\Firefox\Profiles\j8wi2bi6.default\chrome\userChrome.css
		
		2. Add ...

			@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
			#BMB_mobileBookmarks, 
			#BMB_viewBookmarksToolbar, 
			#menu_mobileBookmarks, 
			#BMB_bookmarksToolbar, 
			#menu_bookmarksToolbar,
			#BMB_bookmarksToolbarFolderMenu,
			#menu_bookmarksToolbarFolderMenu,
			#back-button, #forward-button {
				display: none !important;
			} 
            
       3. ENABLE @ about:config 
            
            toolkit.legacyUserProfileCustomizations.stylesheets = TRUE


# Disable 'Push Notifications' a.k.a. 'WebNotifications' PERSISTently.  
  (The annoying pop-up @ left of URL bar upon visiting certain sites.)  

  Update: NEITHER persist @ Firefox 57
  
  - Lowest level method 
    @ URL bar, type 'about:config'  
      @ 'Search:', type 'webnotifications'  
        toggle [double-click] each of these 2 items to 'false' ...  
          dom.webnnotifications.enabled              ... false   
          dom.webnotifications.serviceworker.enabled ... false  
          
    Then close the 'about:config' tab/window; close Firefox.   

  - Higher level method 
    @ URL bar [left-end]; click 'i' [graphic]; click '>' [right-arrow];  
      click 'More Information'  
        @ pop-up window menu, click 'Permissions' tab  
          scroll to 'Receive Notifications'  
            uncheck 'Use Default'; select 'Block'  
    Then close that window; close Firefox.  

# Private Window [32/64-bit]

  "%_ITS_CONTAINER_%\Mozilla Firefox\firefox.exe" -private-window

# disable WebRTC, else hidden analytics js can leak IP even @ secure VPN connection ...

	@ URL: about:config > media.peerconnection.enabled = FALSE 

# profile/cache 

	default location . . . 
		%USERPROFILE%\AppData\Local\Mozilla\Firefox\Profiles\

	TWO METHODS: symlink [junction-point], or about:config
	
		Method 1.

		symlink.bat [JUNCTION]; link entire profile [xyz.profile] dir: 
			
			symlink.bat j PROFILE_PATH CACHE_PATH
			e.g., 
			
			set _PROFILE_PATH=%USERPROFILE%\AppData\Local\Mozilla\Firefox\Profiles\DIRNAME_PER_INSTALL
			symlink.bat j "%_PROFILE_PATH%" "C:\CACHE\Firefox"
		
		Natively ... 
			
			MKLINK /J "%_PROFILE_PATH%" "C:\CACHE\Firefox"

		Method 2. 
		
			@ URL: about:config > 
				browser.cache.disk.parent_directory
				IF key doesn't exist, then right-click and create it.
				
				Set to, e.g., C:\\TEMP\\
			
		
	Firefox will auto-create its dirs, as necessary, from there.