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الخميس، 9 أكتوبر 2014

Google Chrome 40.0.2182.3 Dev/ 38.0.2125.101



Google Chrome, or Chrome, is a web browser software that tries to compete with major players, such as Mozilla Firefox, Internet Explorer, Safari, and even the Opera web browser. It is available for the Linux, Android, iOS, Microsoft Windows, and Mac OS X operating systems. But Google Chrome is more than a web browser, as it combines sophisticated open source technology, borrowed from the Chromium application, into a minimal design, all in order to help users surf the web much faster, a lot easier, and safer than ever before.
Every tab in Chrome is sandboxed, so that a tab can display contents of a web page and accept user input, but it will not be able to read the user’s desktop or personal files.
Google say they have “taken the existing process boundary and made it into a jail”. There is an exception to this rule; browser plugins such as Adobe Flash Player do not run within the boundaries of the tab jail, and so users will still be vulnerable to cross-browser exploits based on plugins, until plugins have been updated to work with the new Chrome security. Google has also developed a new phishing blacklist, which will be built into Chrome, as well as made available via a separate public API.
• Privacy. Google announces a so-called incognito mode claiming that it “lets you browse the web in complete privacy because it doesn’t record any of your activity”. No features of this, and no implications of the default mode with respect to Google’s database are given.
A unique functionality of the Google Chrome application is its ability to search the web directly from the address bar. Just type one or more words in the address bar and immediately get suggestions for popular web pages. The application displays thumbnails of your top websites on the new tab page, a function that is popularly called Speed Dial. This functionality is also available on other similar products, and it allows you to easily access your favorite web pages instantly, with lightning speed, from any new tab.
 • Multiprocessing. The Gears team were considering a multithreaded browser (noting that a problem with existing web browser implementations was that they are inherently single-threaded) and Chrome implemented this concept with a multiprocessing architecture. A separate process is allocated to each task (eg tabs, plugins), as is the case with modern operating systems. This prevents tasks from interfering with each other which is good for both security and stability; an attacker successfully gaining access to one application does not give them access to all and failure in one application results in a “Sad Tab” screen of death. This strategy exacts a fixed per-process cost up front but results in less memory bloat overall as fragmentation is confined to each process and no longer results in further memory allocations. To complement this, Chrome will also feature a process manager which will allow the user to see how much memory and CPU each tab is using, as well as kill unresponsive tabs.

Private browsing is also a strong point of the Google Chrome web browser, enabling users to surf the Internet in an incognito window, when they don't want to save their browsing history, or if they’re hiding from NSA (National Security Agency). Just like Mozilla Firefox, the Chrome web browser includes a handy cloud service, which allows you to safely and securely sync all of your passwords, browsing history, bookmarks, apps, extensions, autofill, themes, and opened tabs across multiple devices.
 • Features. Chrome has added some commonly used plugin-specific features of other browsers into the default package, such as an Incognito tab mode, where no logs of the user activity are stored, and all cookies from the session are discarded. As a part of Chrome’s javascript virtual machine, pop-up javascript windows will not be shown by default, and will instead appear as a small bar at the bottom of the interface until the user wishes to display or hide the window. Chrome will include support for web applications running alongside other local applications on the computer. Tabs can be put in a web-app mode, where the omnibar and controls will be hidden with the goal of allowing the user to use the web-app without the browser “in the way”.
• Rendering Engine. Chrome uses the WebKit rendering engine on advice from the Gears team because it is simple, memory efficient, useful on embedded devices and easy to learn for new developers.
• Tabs. While all of the major tabbed web browsers (e.g. Internet Explorer, Firefox) have been designed with the window as the primary container, Chrome will put tabs first (similar to Opera). The most immediate way this will show is in the user interface: tabs will be at the top of the window, instead of below the controls, as in the other major tabbed browsers. In Chrome, each tab will be an individual process, and each will have its own browser controls and address bar (dubbed omnibox), a design that adds stability to the browser. If one tab fails only one process dies; the browser can still be used as normal with the exception of the dead tab. Chrome will also implement a New Tab Page which shows the nine most visited pages in thumbnails, along with the most searched on sites, most recently bookmarked sites, and most recently closed tabs, upon opening a new tab, similar to Opera’s “Speed Dial” page.



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