• Open a new tab with the URL about:config and set network.stricttransportsecurity.preloadlist to false
• Open a new tab with the URL about:support, click Open Folder to open the profile folder and locate the SiteSecurityServiceState.txt file.
  • Change the permissions on the SiteSecurityServiceState.txt to remove write and delete permissions from the current user.

• 600% sound volume - to increase the sounds of tabs,
• AdNauseam - similar to uBlock but also randomly clicks adds,
• Cookie AutoDelete - auto-delete cookies from last visited domains,
• DownloadManager (S3) - a better download manager,
• Easy Youtube Video Downloader Express - youtube video downloader,
• Form History Control - store forms in case of website difficulties,
• I don't care about cookies - cookie popup blocker,
• KeePassXC - password wallet,
• Nuke Anything - delete parts of pages,
• Print to PDF - create PDF from any web page,
• Privacy Badger - ad / tracker blocker,
• Privacy Pass - helps browse websites through Tor by bypassing captchas,
• Privacy Possum - like Privacy Badger and allegedly better,
• Proxy SwitchyOmega - proxy switcher,
• Redirector - to automatically redirect to webpages based on rules,
• SwitchyOmega - proxy selector with rules,
• Tab Session Manager - manage tabs,
• Translate Web Pages - translates web pages,
• uBlock Origin - ad blocker,
• Snowflake - the tor Snowflake transport (used in conjunction with tor),
• Dark Mode - can be used on obsolete systems to force the theme to dark or light such that websites will display their light or dark version,
• WebStickies - create stickies that are local to a given webpage and pop up again when the page is browsed to

Due to new security changes to Firefox, drag and drop of an image to the desktop might have stopped working. Firefox will try to delevate as much as possible such that dragging and dropping to the desktop will be restricted by the new Firefox security measures. One option is to run Firefox with the –no-delevate command line parameter or to go to the Firefox about:config settings and set browser.launcherProcess.enabled to False.

Given that Adobe Acrobat DC is installed on the machine, the XPI addon package for FireFoxmight be located on the computer at:

C:\Program Files\Adobe\Acrobat DC\Acrobat\Browser\WCFirefoxExtn\WebExtn\signed_extn\adobe_acrobat-1.0-windows.xpi

In order to add the XPI to FireFox, navigate to about:addons, click the gear symbol and select Install Add-on From File….

There exists a hidden setting network.proxy.failover_direct accessible from about::config that is set by default to true. This means that in case a connection to a website cannot be established by a configured proxy server, then Firefox will fall back and bypass the proxy server and access the website directly. By toggling network.proxy.failover_direct to false, firefox will display an error page stating that the configured proxy cannot be reached and will not access the website directly.

This setting is particularly important with addons such as proxy switchers in order to ensure that the connection is established through configured proxies.

Due to Firefox' attempt to be holider than thou, Firefox delevates privileges without even running under the same credentials as the current user. This ends up with the user not being able to drag and drop items to the Desktop or to other applications from Firefox. The suggested fixes involve running Firefox with the -no-deelevate parameter, for instance by changing the shortcut to Firefox:

and by setting browser.launcherProcess.enabled to false in about:config.