Privacy Browser Android

Adding custom headers to all links (https://redmine.stoutner.com/issues/584) has removed the Referer.

This can be tested using the following two URLs.

https://www.whatismyreferer.com/ does not show a Referer header even when linked from a search result. This is expected, as Google has not allowed cross-site Referer headers in WebView since I began developing Privacy Browser.

Loading https://browserleaks.com/ip from https://browserleaks.com/ also does not show a Referer header (see screenshot). This is opposed to Firefox 68.9.0 and Google Chrome 83.0.4103.106, which do. Interestingly, Lightning 5.1.0 sends a Referer header (see screenshot) but FOSS Browser does not (they both use the same WebView as Privacy Browser).

Note that Privacy Browser still sends the Referer header on resource requests. Fixing that problem won't be possible until https://redmine.stoutner.com/issues/586 with Privacy Browser.