thanks @Lordpasta, that worked for me.

I love this addon. Recently google change reverse image search with lens. This addon has an option internal page in contextual menu in 3 dots right side of name in Firefox Addons (about:addons)
Select google and update with this config:
Search URL:
https://lens.google.com/uploadbyurl
Search Variables (One per Line):
url=::$URL::
Finally click in Update Options button.
and now is fixed.

최고의 이미지 검색 부가기능

for google img search
just setting the url to "https://www.google.com/searchbyimage"
and insert a variable "sbisrc=1" (or2nd safe=off)
everything goes on :p

I found this for Google Lens

Just replace in settings:
http://www.google.com/searchbyimage to
https://lens.google.com/uploadbyurl and
image_url=::$URL:: to
url=::$URL::

Everything else works except for Google image search, which is arguably one of the more useful ones.

makes reverse image searching very convenient
best used for artworks as most of the services on it are art-related