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In 1992, an extension to the HTTP protocol was introduced adding a User-Agent HTTP Header which was sent from the client to the server and contained a simple string identifying the name of the client and its version. The header was meant purely for statistical purposes and for tracking down clients that violated the protocol.
On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. [1] This includes all web browsers , such as Google Chrome and Safari , some email clients , standalone download managers like youtube-dl , and other command-line utilities like cURL .
The user agent string format is currently specified by section 10.1.5 of HTTP Semantics. The format of the user agent string in HTTP is a list of product tokens (keywords) with optional comments. For example, if a user's product were called WikiBrowser, their user agent string might be WikiBrowser/1.0 Gecko/1.0. The "most important" product ...
Do Not Track setting in a user's web browser. Read Aloud: GPL-3.0: No No Yes Yes Accessibility A Text to Speech Voice Reader Stylus: GPL-3.0: No No Yes Yes CSS Customization Turn Off the Lights GPL-2.0: No No Yes Yes Customization Obscure or mask content other than a running video. uBlock Origin: GPL-3.0: No No Yes Yes Wide-spectrum content blocker
This meant that a legacy extension could read or modify the data used by another extension or any file accessible to the user running Mozilla applications. [15] But the current WebExtensions API imposes many restrictions. [16] Starting with Firefox 40, Mozilla began to roll out a requirement for extension signing. [17]
The HSTS header can be stripped by the attacker if this is the user's first visit. Google Chrome, Mozilla Firefox, Internet Explorer, and Microsoft Edge attempt to limit this problem by including a "pre-loaded" list of HSTS sites. [11] [12] [13] Unfortunately this solution cannot scale to include all websites on the internet. See limitations ...
A user agent switcher. Opt-in blocking of other background communications, such as extension, GPU blacklist, and certificate revocation updates. [27] Increased number of recent page thumbnails shown on the New Tab page.
Firefox User Extension Library (FUEL) was a JavaScript library intended for developing Mozilla Firefox extensions. Co-created by Mark Finkle and John Resig, it provided JavaScript libraries and wrappers for the most commonly-used operations in Firefox extensions. FUEL was intended to narrow the gap between two modes of development in Firefox.