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Search wikipedia (any language) directly from the address bar. Set the default language in the extension's settings or use a language option (e.g. "wik operating system" or "wik -fr Victor Hugo")

Search wikipedia from Firefox addressbar.

- Default search
type "wik" in the address bar followed by yout search text and press ENTER.
This will search Wikipedia in the default language (English). This language can be changed in the extension's settings.

- Specify a language:
type "wik -it bella ciao" to search for "bella ciao" in https://it.wikipedia.org/ (Italian Wikipedia).
Use -fr for French -de for German and so on.