Initial commit

README.md

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+This quick and dirty Firefox/Chrome extension adds a "Preview" button on `signal.art`, that
+allows to open a pack on `signalstickers.com` for easier preview.
+
+
+![](.github/screenshot.png)
+
+
+
+## Install of Firefox
+
+Go to URL `about:config`, search for `xpinstall.signatures.required` and double-click on the value to set it to `false`. 
+
+Then, in `about:addons`, click on the wheel, select "Install add-on from file", and select `signal.art_preview-[version].zip`.
+
+## Install on Chrome
+
+Go to URL `chrome://extensions/`, enable Developper mode, then load this folder.
+
+
+## Build
+
+> A packaged version is available in the `web-ext-artifacts' directory.
+
+Install [Firefox's tool Web-ext](https://developer.mozilla.org/fr/docs/Mozilla/Add-ons/WebExtensions/Getting_started_with_web-ext).  
+Then, do `web-ext build`.

manifest.json

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+{
+    "description": "Add a 'Preview on signalstickers.com' button on signal.art page",
+    "manifest_version": 2,
+    "name": "signal.art preview",
+    "version": "1.1",
+    "content_scripts": [
+        {
+            "matches": [
+                "https://signal.art/addstickers/*"
+            ],
+            "js": [
+                "signalstickerpreview.js"
+            ]
+        }
+    ],
+    "browser_specific_settings": {
+        "gecko": {
+            "id": "[email protected]",
+            "strict_min_version": "42.0"
+        }
+    }
+}

signalstickerpreview.js

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+function parseParameters(hash) {
+    var params = {};
+
+    hash.split("&").forEach(function (item) {
+        var parts = item.split("=");
+        if (parts.length == 2) {
+            params[parts[0]] = parts[1];
+        }
+    });
+
+    return params;
+}
+
+
+let container = document.getElementById("add-stickers-button");
+
+let previewButton = document.createElement('button');
+previewButton.className = "button button-large";
+previewButton.style.margin = "0 auto 20px auto";
+previewButton.style.display = "block";
+
+let previewLink = document.createElement("a")
+
+let params = parseParameters(window.location.hash.substr(1));
+previewLink.href = `https://signalstickers.com/pack/${params.pack_id}?key=${params.pack_key}`;
+previewLink.target = "_blank";
+previewLink.className = "no-underline";
+previewLink.innerText = "PREVIEW on signalstickers.com";
+
+previewButton.appendChild(previewLink)
+container.appendChild(previewButton);