Ctrl-Shift-S in Firefox ceased saving items
This discussion was created from comments split from: skip message "import into new collection".
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https://forums.zotero.org/discussion/68675/change-default-keyboard-shortcuts-on-firefox
The person in that thread was actually seeing Zotero override the Debugger shortcut. I'm not sure if that's changed since Firefox 57 or if it's somewhat random which one gets precedence. In any case, the fix here will be for Mozilla to 1) allow WebExtensions to reliably override built-in shortcuts and 2) provide a UI to adjust shortcuts.