created browser extension

.gitignore

@@ -1,3 +1,5 @@
 node_modules
 package-lock.json
 data
+*.bak
+*.pem

extension/extension.js

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+$(function() {
+
+    var heads = '<th>Official Rate</th><th>Official Value</th><th>Market Value</th>';
+
+    $("thead tr").append(heads);
+
+
+    ajax = function(options, callback) {
+        var xhr;
+        xhr = new XMLHttpRequest();
+        xhr.open(options.type, options.url, options.async || true);
+        xhr.onreadystatechange = function() {
+            if (xhr.readyState === 4) {
+                return callback(xhr.responseText);
+            }
+        };
+        return xhr.send();
+    };
+
+    ajax({
+        type: "GET",
+        url: "http://api.fairplayground.info/rawdata/faircoin_prices.csv",
+    }, processData);
+
+
+    function processData(data) {
+        if(data) priceData = csvToArray(data);
+        //   $(".inner-cont").append("priceData: ");
+        //   $(".inner-cont").append(priceData);
+
+        if (priceData) {
+
+            $('tbody  > tr').each(function() {
+
+
+                var dateVar = $(this).find('td:first').text();
+                var d = new Date(dateVar);
+                var dateISO = d.toISOString().slice(0, 10);
+
+                var faircoins = $(this).find('td:nth-child(3)').text();
+
+                // 		$(this).append('<td>'+faircoins+'</td>');
+
+                calculateEuros(dateISO, faircoins, this);
+
+            });
+        }
+    };
+
+    function calculateEuros(date, faircoins, el) {
+
+        if (!faircoins) {
+            console.log("please, fill the faircoin input box");
+            return;
+        }
+        if (!date) {
+            console.log("no date");
+            return;
+        }
+
+        //let's find the date in the priceData
+        var selectedPriceData = [];
+        for (var i = 0; i < priceData.length; i++) {
+            if (priceData[i][0] == date) {
+                selectedPriceData = priceData[i];
+            }
+        }
+        if (selectedPriceData.length < 1) {
+            console.log("selected date not found in the dataset");
+            return;
+        }
+
+//         console.log(selectedPriceData);
+
+        var euros = faircoins * selectedPriceData[3];
+        var market = faircoins * selectedPriceData[2];
+
+
+        $(el).append('<td>' + parseFloat(selectedPriceData[3]).toString() + '</td>');
+        $(el).append('<td>€ ' + (Math.round(euros * 100) / 100) + '</td>');
+        $(el).append('<td>€ ' + (Math.round(market * 100) / 100) + '</td>');
+    }
+
+
+    function csvToArray(csv) {
+        var a1 = csv.split("\n");
+        var r = [];
+        for (var i = 0; i < a1.length; i++) {
+            var a2 = a1[i].split(",");
+            r.push(a2);
+        }
+        return (r);
+    }
+
+
+});

extension/manifest.json

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+{
+  "manifest_version": 2,
+  "name": "FairCoin Calculator",
+  "version": "1.0",
+  "permissions": [
+    "webRequest",
+    "<all_urls>",
+    "*://api.fairplayground.info/*"
+  ],
+  "content_scripts": [
+    {
+      "matches": [ "https://chain.fair.to/address*" ],
+      "js": [ "jquery-3.3.1.min.js", "extension.js" ]
+    }
+  ],
+  "gecko": {
+    "id": "faircoin-calculator@mayel.space"
+  }
+}