On holiday I on may notebook with the “siwss german” key layout. This lead to the issue with Chrome + vimium extentions and the marks key. The default key to jump to a mark is “`” which need shift and two strokes to the key with the “`”.
On vimium readme it is not explained how to modify this key to “‘” . But the solution is:
map ' Marks.activateGotoMode
Just add this in the vimium options page under the remapping section.