This may not be a Firefox / Ubuntu specific issue.
When I Copy / Paste a web link with _ and ( ) it is rendered as %20, %28, and %29.
Yet in the Firefox URL these % symbols do not appear.
The %20 is particularly weird because the _ itself does render in the URL:
https://www.capitalsecuritybank.com/en/PDF/CSB_%20Account_%20Application_%20Form_%20%28Personal%29.pdf
Can anyone explain why the URL is different when Copied / Pasted?
%HH
whereH
s are hexadecimals are url-encoded versions of(
,)
and _. Same for spaces (
%20`). See wikipedia. – Lekensteyn Oct 18 '13 at 21:29