[lucky_cloud]

I'd like to use FF but I've never been able to figure out how to replicate something Safari does that's ingrained in my fingers at this point.

In Safari, I can use command+1-9 to open bookmarks. So command+1 is my PRs, command+2 is the JIRA board for the current sprint, etc.

[bmn__]

You can give bookmarks nicknames, e.g. "PR". You can activate those from the location bar by typing the nickname. Then set up a keyboard macro that maps <command>+<1> to <control>+<l>, <p>, <r>, <Enter> etc.