declared new function and configuration flag #38
invalid variable name #38
tested, working func to highlight posts by id #38
extracted setAllPostsOpacity #38
working button for highlighting #38
working unhighlighting #38
changing label from "Pokaż posty" to "Cofnij" #38
configuration variable #38
setting button title and comments #38
several syntax corrections #38
removed unnecessary <span> parent #38
trying to pull mlekomleko request
further improved aesthetics

lowered interface size so it doesn't distract the reader
now can show post near highlight button #38

can configure the interface via
showPostCountNearId
and
showPostCountNearHighlightPostsButton
flags.
enableJumpButtons configuration flag
removed comments and fixed flag

also changed innerHTML to textContainer
and changed Cofnij to Pokaż wszystkie
marked some configuration flags as internal
other corrections
brief notation
fixed whitespaces