Control and Alt keybindings broken recently

Since a few days now I noticed that some keybinding combinations with Ctrl and Alt became broken. As an example my config binds f (without modifier) to scroll up and I have also unmap <c-f> in my config so that c-f activates Firefox's own search. This worked until recently but now when I hit c-f I get scroll up...

Same e.g. for c-a executes my a keybinding rather then selecting text.

I remember having a similar issue some years back while still on vimium+Chrome...

Thank you!

No files, tests, or entry points are identified. Reproduce the reported c-f and c-a behavior with the example bindings, then locate the keybinding handling and establish regression coverage; done means modifier combinations no longer trigger the unmodified keybinding.