Just add the contents of the following resource to your hosts^1, 2-file:
https://hara.tc/HOSTS

^{1: In Windows the hosts-file should be found in the directory %WINDIR%\System32\drivers\etc\. — Since this file is normally write-protected, simplky copy it to the desktop and edit the copy. Afterwards copy it back to the original directory and approve the warnings.
2: In Linux the hosts-file should be found in the directory /etc/. — Since this file is normally write-protected, edit it with root-rights (e.g. using the sudo-command).}

With the update to Version 4, all kinds of ed2k plugins stopped working with Firefox… Hence, own scripting is required.

Create a file ed2k.bat in your Firefox directory and copy the following content into it. Alternatively, you can download the file and edit it.

Show contents of the file.

Hide contents of the file.

@echo off
rem
rem This litte script sends ed2k-links to your eMule Remote Control using Firefox.
rem You need to set up this file and edit your registry though.
rem
rem 0) Copy this file into your Firefox location (Should you not know the location, but are sure you have installed Firefox using all defaults, you can find the default location in line 53 of this file)
rem
rem 1) Open Firefox and browse to "about:config"
rem
rem 2) Confirm the warning
rem
rem 3) Right-click in the lower area, select "new", then "Boolean"
rem 3.1) Name the new Boolean "network.protocol-handler.external.ed2k"
rem 3.2) Give the new Boolean the value "true"
rem
rem 4) Right-click in the lower area, select "new", then "Boolean"
rem 4.1) Name the new Boolean "network.protocol-handler.expose.ed2k"
rem 4.2) Give the new Boolean the value "false"
rem
rem 5) Right-click in the lower area, select "new", then "String"
rem 5.1) Name the new String "network.protocol-handler.app.ed2k"
rem 5.2) As value, assign the path to the file to the new String
rem
rem 6) Terminate Firefox
rem
rem 7) Press Win+R and enter "regedit"
rem
rem 8) Confirm the UAC-warning
rem
rem 9) If it exist, browse to, otherwise create "HKEY_CLASSES_ROOT\ed2k", "HKEY_CLASSES_ROOT\ed2k\DefaultIcon" and "HKEY_CLASSES_ROOT\ed2k\shell\open\command"
rem
rem 10) in "HKEY_CLASSES_ROOT\ed2k" edit if they exist, otherwise create inputting:
rem 10.1) String "HKEY_CLASSES_ROOT\ed2k\(Default)" gets value "URL: ed2k Protocol"
rem 10.1) String "HKEY_CLASSES_ROOT\ed2k\URL Protocol" gets value ""
rem 10.3) String "HKEY_CLASSES_ROOT\ed2k\DefaultIcon\(Default)" gets the path to your firefox.exe as value
rem 10.4) String "HKEY_CLASSES_ROOT\ed2k\shell\open\command\(Default)" gets value ""FIREFOX_PATH\ed2k.bat" "%1"" (note the quotations (") within the quotation; they are important) (replace "FIREFOX_PATH" with the actual path to your Firefox-installation)
rem
rem 11) Close the Registry-Editor
rem
rem 12) Scroll down to line 52 and fill in the drive letter of your Firefox-installation (normally, this is "C:"; if you are not sure and have installed Firefox using the default setting, leave this as "C:")
rem
rem 13) Scroll down to line 53 and fill in the path to this file
rem
rem 14) Scroll down to line 54 and fill in the URL of your eMule Remote
rem
rem 15) Scroll down to line 55 and fill in the port of your eMule Remote
rem
rem 16) Scroll down to line 56 and fill in the password required to access your eMule Remote
rem
set link=%1
for /f "useback tokens=*" %%a in ('%link%') do set link=%%~a
C:
cd "\Program Files (x86)\Mozilla Firefox\"
set eurl=example.com
set port=4711
set pswd=examplepassword
firefox -new-tab "https://%eurl%:%port%/?w=password&p=%pswd%&cat=0&c=%link%"

Should your Firefox support it (I don’t know why, but mostly this does not work), install the plugin “Redirector“ and create a new rule:

• “Example URL”: “ed2k://|file|Test.file|1234567|B5D4431E5C940BE04CB5365EAFEC1C48|h=UBGZJ5LQPLYUXQYQAUEBZOHO7HBT65ZT|/”
• “Include Pattern”: “ed2k://\|file\|([^/:@]*)\.([a-zA-Z0-9]{1,4})\|([0-9]{1,10})\|([a-fA-F0-9]{32})\|h=([a-zA-Z0-9]{32})\|/”
• “Redirect To”: “http://example.com:4711/?w=password&p=examplepassword&cat=0&c=ed2k%3A%2F%2F%7Cfile%7C$1.$2%7C$3%7C$4%7Ch%3D$5%7C%2F”
• Check the checkbox “Escape matches”

Utilising Redirector for Firefox/Waterfox one can dynamically rewrite URLs during they are called. Often, after clicking a Google result or Shortnews article, the then displayed advertisement sites do not load properly; hence, I can often not redirect to the page I actually want to load (e.g. for Shortnews the original source article). Therefore, I wrote a few Redirector rules in order to circumvent the advertisement sites. Of course, there are nicer addons for Firefox/Waterfox with the same or better functionality (e.g. blocking all advertisements), but Redirector rules are a nice means of training regular expressions.

• Version of 20 February 2014 (redirector_20140220.rjson)

After installing the Redirector-Addon, simply right-click the R icon ans select “import” in the upper right.