mohamedmansour/manifest.json

## manifest.json
{
 "name": "Selected Text",
 "version": "0.1",
 "description": "Selected Text",
 "browser_action": {
   "default_title": "Selected Text",
   "default_icon": "icon.png",
   "default_popup": "popup.html"
 },
 "permissions": [
   "tabs"
 ],
 "content_scripts": [
  {
    "matches": ["http://*/*"],
    "js": ["selection.js"],
    "run_at": "document_start",
    "all_frames": true
  }
 ]
}

## popup.html
<!DOCTYPE html>
<html>
<style>
  body { width: 300px; height: 100px; margin: 0; padding: 0;}
  textarea { width: 295px; margin: 0; padding: 0; height: 100px; }
</style>
<textarea id="text"> </textarea>
<script>
chrome.tabs.getSelected(null, function(tab) {
  chrome.tabs.sendRequest(tab.id, {method: 'getSelection'}, function (response) {
    var text = document.getElementById('text');
    text.value = response.data;
  });
});
</script>
</html>

## selection.js
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
  if (request.method == 'getSelection') {
    sendResponse({data: window.getSelection().toString()});
  }
  else {
    sendResponse({}); // snub them.
  }
});
	{
	"name": "Selected Text",
	"version": "0.1",
	"description": "Selected Text",
	"browser_action": {
	"default_title": "Selected Text",
	"default_icon": "icon.png",
	"default_popup": "popup.html"
	},
	"permissions": [
	"tabs"
	],
	"content_scripts": [
	{
	"matches": ["http:///"],
	"js": ["selection.js"],
	"run_at": "document_start",
	"all_frames": true
	}
	]
	}
	chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
	if (request.method == 'getSelection') {
	sendResponse({data: window.getSelection().toString()});
	}
	else {
	sendResponse({}); // snub them.
	}
	});