Codemirror plugin was the issue.
After disabling every thing works fine.
W dniu czwartek, 16 lutego 2017 12:22:31 UTC+1 użytkownik Space napisał:
> I have problem with spell checking.
> I downloaded single file version (the empty one) for Firefox.
> In Firefox I have enable automatic check while typing (and it is working
> for example on this forum while I typing this post).
> But when I edit tiddler and write something wrong it is not underline with
> red line.
> Also when I edit tiddler and click RMB on that word I have "Check
> Spelling" item (unchecked) on dropdown menu but when I LMB on "Check
> Spelling" whole menu disappears but this item is still unchecked .
> Firefox version: 51.0.1 (64-bit)
> Tiddlywiki version: 5.1.13
> Language tiddlywiki settings: English (British)
> Dictionary in Firefox: United States English Spellchecker 8.1
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