In Browser Chrome by Google or Firefox and Thunderbird by Mozilla you can per default configure only the setting for one internet connection. If you liked to use once a direct connection or different proxy configurations, then the dialog "Connection Settings" has respectively to be executed newly.

With the ProxySwitch you can manage different configurations and simply switch over between these. The following documentation describes the complete range of functions. The extension contains the appropriate documentation.


From Firefox 57, the previously used native interface (XUL) has been omitted, this caused a complete reprogramming with the new interface WebExtension of Firefox. This interface does not yet contain all previous functions. Therefore, in the extension ProxySwitch for WebExtension the affected function is removed first.


Browsers that use the open source project Chromium, e.g. Google Chrome, Microsoft Edge or Vivaldi. These browsers use the system setting for proxy configuration by default. If the extension is activated, the system setting is not used. The settings specified in the extension are then used! However, other programs still use the system settings for access to the Internet.


Gratis version (freeware and open source)

Requested permissions

Control browser proxy settings
Required for the basic function of the ProxySwitch.
Clear recent browsing history, cookies, and related data
Required for the function clear=cache. This deletes the cache of the browser.
Access your data for all websites
Required for the function Automatic switching (testUrl), to check the reachability of a user specified URL. This is implemented via a head request to the server.


For Firefox version 67 or higher

So that the MM3-ProxySwitch to change the proxy settings, you must allow this extension to use private windows. After that you can use the extension permanently.

Do this as follows
  1. In the Firefox menu: Tools / Add-ons (or keyboard: Ctrl + Shift + A or Url: about:addons)
  2. Select the category: Extensions
  3. Select the extension: MM3-ProxySwitch
  4. Allow: Run in Private Windows


MM3-ProxySwitch - Firefox, Chrome, Edge WebExtension (Add-ons)
Click on the ProxySwitch symbol and a pop-up menu opens
  • If the option Active is enabled here, the selected proxy configuration is used. Otherwise, a direct Internet connection is established.

    You recognize the used connection by the symbol:
    • Use proxy configuration
    • Direct Internet connection
    Tool Tipp

    This specifies the name of the configuration in use.

  • You can select a proxy configuration from the popup menu.
  • Edit the proxy configurations with: Settings.

Structure of the proxy configuration

Every configuration has a definite name and starts with the opening bracket [ and ends with the closing bracket ].
This name of the proxy configuration is displayed in the popup menu.
The both brackets [ and ] as well as every keyword must be in a new line.
According to the structure in the following example.

[Name http=... ]

Proxy configuration

You can use the following keywords for the configuration:

http =IP address:[ 80|port] https =IP address:[ 443|port] ftp =IP address:[ 21|port] all =IP address:[ 80|port] socks =IP address:[1080|port] socks4=IP address:[1080|port] noProxy=... url=...
http, ssl, ftp, socks or socks4
Enter the proxy for any required protocol.
The same proxy is used for the protocols http, https and ftp.
For the given domains the proxy shall not be used.
Several domains are separated by a comma. This corresponds to the syntax of Firefox.
URL to the script for the automatic proxy configuration.
With the parameter reload the script is loaded newly when switching.
[MM3-WebAssistant http = https = ftp = noProxy= ] [localProxy all= ] [provider http=HTTP-Proxy of you provider ] [script url= ]

Predefined proxy configurations

The following two proxy configurations are predefined. These can be extended with additional settings.

[System ... ] [Auto ]
Use system proxy settings.
Auto-detect proxy settings for this network.


When switching over the proxy configuration a other homepage can be displayed. To this you indicate the homepage at the respective proxy configuration with the keyword homepage.

[MM3-WebAssistant http=... homepage= ]

Delete browser cache

Before you use the Offline Browser WebAssistant - Proxy Offline Browser, the cache of your browser should be deleted. With the keyword clear this is carried out automatically.

[MM3-WebAssistant http=... clear=cache ]


To switch between different proxy configurations, you can use the following four keyboard shortcuts:

Ctrl + Shift + 1
Ctrl + Shift + 4

The first four proxy configurations are activated or switched over.


If another extension already uses the same shortcut, you must decide which extension this shortcut should use. In this case, delete both extensions and install the extension that should use this shortcut first.


You can now define the four shortcuts yourself. This allows you, for example, to avoid the conflict described above.

Activation of a proxy configuration

If you select a proxy configuration, then this is immediately used per default. With active=no the select configuration is entered. The direct connection to the internet is used, however.

[MM3-WebAssistant http=... active=no ]

This is obvious if you use the automation of the proxy configuration and you don't need a proxy at every location.

Change symbol

The keyword symbol can be used to change the representation for a proxy configuration. This allows each active proxy configuration or a direct Internet connection to be displayed differently.

symbol=[color:color value;] [colorActive:color value;] [shape[:square]]
color:color value
For a direct Internet connection
Default color value is #808080 for gray
colorActive:color value
For an active proxy configuration
Default color value is #900 for red

Color value must be specified according to HTML or CSS syntax.

By default, the symbol is displayed
Symbol is displayed as a square

The keywords can be defined inside and outside a proxy configuration; within, the keywords apply only to this proxy configuration.

[MM3-WebAssistant http=... symbol=colorActive:green ] [Company http=... symbol=colorActive:blue;shape:square ] ... symbol=color:#000

For a direct Internet connection, the symbol is always displayed in "black" (#000). If the proxy configuration MM3-WebAssistant is activated, the symbol MM3 is displayed "green". If the proxy configuration Company is selected, the symbol is displayed as a square. If Company is then activated, the color changes from "black" to "blue".


Lines can be marked as comment lines. These lines can only contain comments.


Comment lines start with the character: #

# These are three comment lines: # Proxy configuration to use the # MM3-WebAssistant - Proxy Offline Browser [MM3-WebAssistant http=... ]

DNS lookups

The keyword proxyDNS controls whether DNS lookups for SOCKS version 5 clients happen on the client or on the proxy server. With the value true the proxy server perform DNS lookups.

[Company socks=... proxyDNS=true ]

With the Chrome browser, the proxy server always requests the DNS, so the keyword is omitted.

Automation of the proxy configuration

If you use different networks with your laptop computer, then the required configuration can be determined automatically. There are two possibilities for it.

Automatic switching

Starting the Firefox it is checked whether an URL is available. Into dependence of this test the direct connection to the Internet or the proxy is used.

testUrl=URL [direct|proxy|both]
URL to be checked.
Check is executed if you activate in the Firefox: Direct connection to the Internet.
Check is only executed if a proxy configuration is activated.
Check is always executed

If in the test the URL is available, the proxy configuration is used.

The testUrl can be noted inside and outside a proxy configuration; for inside, the testUrl only applies to this proxy configuration.

[MM3-WebAssistant http=... testUrl= both ]

The availability of the WebAssistant - Proxy Offline Browser is checked here. If this proxy has started, then this is used.

IP-Address determines proxy configuration

The IP address used currently determines the matching proxy configuration from several deposited entries.

The respective IP address is the name of the proxy configuration.
If you need an area of IP addresses, then you indicate only the constant part with that the IP address starts.

Optional the configuration with the name: default
This configuration is used, if nones of the given IPs are found.

You see the used syntax at the following example.

  • Configurations for the IP addresses:
    • IP address:
    • IP address area: to
  • One configuration for all other IPs

Enter for this in the editor:

[ http=... ] [10. http=... ] [default http=... ] import=IP

The entry import=IP activates this function so that at every restart of the Firefox the matching proxy configuration is used.
Alternative: Use the ProxySwitch menu: Import IP


If your computer binds several IPs at the same time, the order of the configurations is importance. The search for a matching IP starts with the last configuration.

Import of the proxy configuration from the Internet Explorer

If your Internet Explorer is already configured automatically into dependence of your network environment, then you can use this configuration also in the Firefox.

This proxy configuration gets the name in the ProxySwitch: IE

Enter for this in the editor:


Now every restart of the Firefox imports the active proxy configuration of the Internet Explorer.
Alternative: Use the ProxySwitch menu: Import IE


Function is only available in the Firefox (version 1.5 and higher) for Windows.

Preference config

Would you like to change further preferences at switching of the proxy configuration? You set these to the keyword config: and a preference (name=value) at the respective proxy configuration.

[ProxyDNS socks=... config:network.proxy.socks_remote_dns=true ]

The preference name network.proxy.​socks_remote_dns controls whether DNS lookups for SOCKS v5 clients happen on the client or on the proxy server. With the value true the proxy server perform DNS lookups.

Standard settings

If you liked to assign a standard setting to a keyword, then you give this pre-allocation after the last closing bracket ].

This is possible for the following keywords:
http, ssl, ftp, socks, socks4, socks5, noProxy, clear and homepage

[MM3-WebAssistant http=... ] clear=cache homepage=

Editor: Format

The type can be formed with CSS syntax for font, size, color, background etc.

Code for the formatting
[MM3-WebAssistant http=... ] style:editor=font-family:monospace;

In the editor the text is displayed with a monospace font.


Creative Commons License
Creative Commons
GNU General Public License

MM3-ProxySwitch - Firefox, Chrome, Edge - Extension (Add-ons)

MM3 ProxySwitch - Firefox, Chrome, Edge Extension (Add-ons)

You would like to save web pages and use these offline?

The ProxySwitch completes ideally the WebAssistant - Proxy Offline Browser.

You would like to save web pages and use these offline?

With the WebAssistant you click a link and the page is shown as normal, also adds the page to an archive on your hard disk enabling offline access, bookmarking and searching.

Go to Download WebAssistant - Proxy Offline Browser