Преглед на кода на Digital signature support in Firefox 35 and newer

<!--In Mozilla Firefox 35 digital signing function has been removed. This breaks many sites that use signing in the browser.

In order to fix this problem the following add-on - '''signTextJS''' must be installed from https://addons.mozilla.org/firefox/addon/signtextjs/.
<!--In order to fix this problem the following add-on - '''signTextJS plus''' must be installed from https://addons.mozilla.org/firefox/addon/signtextjs-plus/.

Add-on installation is not necessary for web sites that Java applets for signing, such as National Revenue Agency and Commercial register of Registry Agency.-->