--- a/browser/components/search/searchplugins/mercadolibre-ar.xml
+++ b/browser/components/search/searchplugins/mercadolibre-ar.xml
@@ -1,15 +1,14 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
 <ShortName>MercadoLibre Argentina</ShortName>
 <Description>MercadoLibre Argentina</Description>
-<InputEncoding>ISO-8859-1</InputEncoding>
+<InputEncoding>UTF-8</InputEncoding>
 <Image width="16" height="16">data:image/x-icon;base64,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-<Url type="text/html" method="GET" template="http://www.mercadolibre.com.ar/jm/search" resultdomain="mercadolibre.com.ar">
+<Url type="text/html" method="GET" template="https://www.mercadolibre.com.ar/jm/search" resultdomain="mercadolibre.com.ar">
     <Param name="as_word" value="{searchTerms}"/>
-    <Param name="source" value="firefox_box"/>
 </Url>
-<SearchForm>http://www.mercadolibre.com.ar/</SearchForm>
+<SearchForm>https://www.mercadolibre.com.ar/</SearchForm>
 </SearchPlugin>

--- a/browser/components/search/searchplugins/mercadolibre-cl.xml
+++ b/browser/components/search/searchplugins/mercadolibre-cl.xml
@@ -1,15 +1,14 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
 <ShortName>MercadoLibre Chile</ShortName>
 <Description>MercadoLibre Chile</Description>
-<InputEncoding>ISO-8859-1</InputEncoding>
+<InputEncoding>UTF-8</InputEncoding>
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-<Url type="text/html" method="GET" template="http://www.mercadolibre.cl/jm/search" resultdomain="mercadolibre.cl">
+<Url type="text/html" method="GET" template="https://www.mercadolibre.cl/jm/search" resultdomain="mercadolibre.cl">
     <Param name="as_word" value="{searchTerms}"/>
-    <Param name="source" value="firefox_box"/>
 </Url>
-<SearchForm>http://www.mercadolibre.cl/</SearchForm>
+<SearchForm>https://www.mercadolibre.cl/</SearchForm>
 </SearchPlugin>

--- a/browser/components/search/searchplugins/mercadolibre-mx.xml
+++ b/browser/components/search/searchplugins/mercadolibre-mx.xml
@@ -1,15 +1,14 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
 <ShortName>MercadoLibre Mexico</ShortName>
 <Description>MercadoLibre Mexico</Description>
-<InputEncoding>ISO-8859-1</InputEncoding>
+<InputEncoding>UTF-8</InputEncoding>
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-<Url type="text/html" method="GET" template="http://www.mercadolibre.com.mx/jm/search" resultdomain="mercadolibre.com.mx">
+<Url type="text/html" method="GET" template="https://www.mercadolibre.com.mx/jm/search" resultdomain="mercadolibre.com.mx">
     <Param name="as_word" value="{searchTerms}"/>
-    <Param name="source" value="firefox_box"/>
 </Url>
-<SearchForm>http://www.mercadolibre.com.mx/</SearchForm>
+<SearchForm>https://www.mercadolibre.com.mx/</SearchForm>
 </SearchPlugin>

--- a/browser/components/search/searchplugins/mercadolivre.xml
+++ b/browser/components/search/searchplugins/mercadolivre.xml
@@ -1,15 +1,14 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
 <ShortName>MercadoLivre</ShortName>
 <Description>Onde comprar e vender de Tudo.</Description>
-<InputEncoding>iso-8859-1</InputEncoding>
-<Image width="16" height="16">data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAABnRSTlMAAAAAAABupgeRAAABnklEQVR4nGNgGPqA8f///wwMDP///7199/2Js28fPvspI/b3758P////Y2IWfPiCjYeX1d9ZREWRj5mFlYGBgeH///+XrrycMONSZtk5LeOw//8Z0FBVuYSm1eaqljNHTjz6//8/4/lLL1asedTRaPr3H8P+A7vF+dM+fDBk5Cj+8OkDL8ctxr+b/zDYCktU6euwF1WfDPaVYsgsPnL+0vPnz/7+RwUXrvw/fALB/fXt/8sX3+z9N7F8/PznyOkPxzdpJMSp/WXtklV3EORjkJJg0NdmOHb624rNXAL/lgmy1967fe8h6/nnr38y8QmyLlj5nFk8zDXotIe04945NacuMhw7x/DkE8Odp1yP95R46Eabe9z7yKy3fstHNSUhhj9/fzoG7mBgWJCcZAD36OalfVuXNJ7dwAvhtjYqMjDMEtVe9+HjVwaIE2cvvcjAuI6BqSIzT3DLCoZdyxj2rWLYvpqhqJSfgSuHgWFVXc9piEpG5Eh58Oz/zj2fn7x79erN+1+//3NzcKtKSznYC+ipMTAwMDAyMmKJyEEAAHOj6iZS/gfAAAAAAElFTkSuQmCC</Image>
-<Url type="text/html" method="GET" template="http://pmstrk.mercadolivre.com.br/jm/PmsTrk" resultdomain="mercadolivre.com.br">
-  <Param name="tool" value="5668605"/>
-  <Param name="go" value="/jm/search%3fas_word={searchTerms}%26as_search_both=N"/>
+<InputEncoding>UTF-8</InputEncoding>
+<Image width="16" 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+<Url type="text/html" method="GET" template="https://www.mercadolivre.com.br/jm/search" resultdomain="mercadolivre.com.br">
+    <Param name="as_word" value="{searchTerms}"/>
 </Url>
-<SearchForm>http://www.mercadolivre.com.br/</SearchForm>
+<SearchForm>https://www.mercadolivre.com.br/</SearchForm>
 </SearchPlugin>