I had installed this add-on because the new Saka Key wasn't working anymore. Here, we have more options for key actions than Saka Key had but some of the Saka Key options (such as move tab to first/last, open a private window, subpage scrolling) are not available.

My main problem is, that this add-on sometimes grabs the key input of a focused text element on the page. Not sure why, if this is bad web-programming or whether it could be mitigated by the add-on. I need to use the search bar sometimes to copy-paste text field content.

Some pages which aren't working: recipient line mail client (GMX) and Reddit's Markdown text field. (And as it seems, they didn't change anything as response to my feedback, the problem is persistent.) Mainly simple text fields are affected which do not provide additional buttons. Basically 3.5 of 5 stars.