no, really, ƒ$çk you, jira sidebar.Extension to effectively "hide" the right-hand sidebar (e.g. People, Dates, Agile sections) when viewing Jira issues. Particularly useful when viewing wide {noformat} panels.
Clicking extension icon ("fu") will shrink width of the sidebar to 0px, which causes chrome to render it off the side of the screen, resulting in the main panel -- particularly the Activity/comments section most folks spend their time looking at -- expanding to full width. Clicking the icon again will revert to sidebar getting default 35% of horizontal space.
source code at https://github.com/nderp/fusidebar, all 42 lines of it.
who says you can't teach an old dog new javascript tricks?