diff --git a/CHANGELOG.md b/CHANGELOG.md
deleted file mode 100644
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--- a/CHANGELOG.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# Modified variables
-
-| Variable                                                                                                                                                                                                       | Description                                                                                                                                                                                                                                                                                                                                                                                                               |
-|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **<a id="manual.http_proxy.address" name="manual.http_proxy.address">manual.http_proxy.address</a>**<br/>[`domainname`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`    | ~~Proxy address.~~<br/><ins>HTTP proxy address.</ins><br/>**Validators**: <br/>•&nbsp;type domainname<br/>•&nbsp;the domain name can be an IP                                                                                                                                                                                                                                                                             |
-| **<a id="manual.http_proxy.port" name="manual.http_proxy.port">manual.http_proxy.port</a>**<br/>[`port`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                   | ~~Proxy port.~~<br/><ins>HTTP proxy port.</ins><br/>**Validators**: <br/>•&nbsp;well-known ports (1 to 1023) are allowed<br/>•&nbsp;registred ports (1024 to 49151) are allowed<br/>•&nbsp;private ports (greater than 49152) are allowed<br/>**Default**: 8080                                                                                                                                                           |
-| **<a id="manual.https_proxy.address" name="manual.https_proxy.address">manual.https_proxy.address</a>**<br/>[`domainname`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory` | ~~Proxy address.~~<br/><ins>HTTPS proxy address.</ins><br/>**Validators**: <br/>•&nbsp;type domainname<br/>•&nbsp;the domain name can be an IP<br/>**Default**: ~~the value of the variable "[Proxy address](#manual.http_proxy.address)".~~<br/><ins>the value of the variable "[HTTP proxy address](#manual.http_proxy.address)".</ins>                                                                                 |
-| **<a id="manual.https_proxy.port" name="manual.https_proxy.port">manual.https_proxy.port</a>**<br/>[`port`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                | ~~Proxy port.~~<br/><ins>HTTPS proxy port.</ins><br/>**Validators**: <br/>•&nbsp;well-known ports (1 to 1023) are allowed<br/>•&nbsp;registred ports (1024 to 49151) are allowed<br/>•&nbsp;private ports (greater than 49152) are allowed<br/>**Default**: ~~the value of the variable "[Proxy port](#manual.http_proxy.port)".~~<br/><ins>the value of the variable "[HTTP proxy port](#manual.http_proxy.port)".</ins> |
-| **<a id="manual.socks_proxy.address" name="manual.socks_proxy.address">manual.socks_proxy.address</a>**<br/>[`domainname`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory` | ~~Proxy address.~~<br/><ins>SOCKS proxy address.</ins><br/>**Validators**: <br/>•&nbsp;type domainname<br/>•&nbsp;the domain name can be an IP<br/>**Default**: ~~the value of the variable "[Proxy address](#manual.http_proxy.address)".~~<br/><ins>the value of the variable "[HTTP proxy address](#manual.http_proxy.address)".</ins>                                                                                 |
-| **<a id="manual.socks_proxy.port" name="manual.socks_proxy.port">manual.socks_proxy.port</a>**<br/>[`port`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                | ~~Proxy port.~~<br/><ins>SOCKS proxy port.</ins><br/>**Validators**: <br/>•&nbsp;well-known ports (1 to 1023) are allowed<br/>•&nbsp;registred ports (1024 to 49151) are allowed<br/>•&nbsp;private ports (greater than 49152) are allowed<br/>**Default**: ~~the value of the variable "[Proxy port](#manual.http_proxy.port)".~~<br/><ins>the value of the variable "[HTTP proxy port](#manual.http_proxy.port)".</ins> |
diff --git a/firefox/30-auto.yml b/firefox/30-auto.yml
new file mode 100644
index 00000000..50961391
--- /dev/null
+++ b/firefox/30-auto.yml
@@ -0,0 +1,11 @@
+%YAML 1.2
+---
+version: 1.1
+
+auto:
+  description: Automatic proxy configuration URL
+  type: web_address
+  disabled:
+    variable: _.proxy_mode
+    when_not: Automatic proxy configuration URL
+...