Is there a Keyboard Shortcut to put the focus on Firefox's Sidebar?
I use the Add-On "Bookmark search plus 2" which is really awesome. When I activate it's Keyboard Shortcut (Ctrl + Q), the Sidebar opens, but I have to use my mouse to click on the Sidebar to grant it focus. I looked around online and haven't found anything. If anyone knows of a way, a Keyboard Shortcut, a tool or another Add-On perhaps, please let me know! Cheers!
I doubt any extension could do it either (new WebExtension API deems such behavior/functionality insecure/too privileged).
I hope it could be customizable by "user.js" or a similar javascript file put in your Firefox profile. If anyone finds anything, report here, please.
Partial alternative: Right click at BSP2 icon > "Open BSP2 in a Tab". Potentially pin the tab. Then Ctrl+TAB to switch back and forth.
For other extensions, figure out "moz-extension://..." URL to their files shown in the sidebar. It may not work exactly well/same as in a sidebar (or it may work better).
To anyone who would be looking for an answer to my question: I ended up making it work with an AutoHotkey Script. When I press the Hotkeys that open Firefox's Sidebars, I have AutoHotkey automatically place the Mouse Cursor in the Textarea I want, Click, then relocate the Mouse Cursor to where it initially was, in a flash of a second.