Firefox

about:config

about:config

Disable Fullscreen Animation (Fade)

about:config: browser.fullscreen.animateUp: 0

Hacker’s Address Bar

Show http[s]:// in address bar and do not grey-out parts of URLs (about:config). Also remove the stupid redirect to “localhost.com”:

browser.urlbar.trimURLs = false
browser.urlbar.formatting.enabled = false
browser.fixup.alternate.enabled = false

https://support.mozilla.org/en-US/questions/863047

Reduce delay for download dialog

I guess it’s in ms, but I don’t care. UI rendering is enough delay:

security.dialog_enable_delay = 0