Hello mundisgl,

Did you checked the same answer that question had.

https://support.mozilla.org/en-US/questions/1078548#answer-769206

irisbis - 8/18/15, 9:27 PM

I now know why it happened: 
My privacy settings were put on not collecting the history, 
which caused to add ons from not working properly.
I changed it, and everything functions again!
Thank you for the comments and help nevertheless :)

Thank you!

Thanks for the answer Rashan, I can indeed fix the issue by enabling the history. However, I would like to know why is it that firefox can not show add-ons on the toolbar and have the history disabled simultaneously.

You can re enable the add ons if you have history forgotten by going to the add ons and enabling them for "private windows." It appears putting firefox in "never remember history" is like a permanent private window mode.

This could be clearer within the settings.

See also:

• https://support.mozilla.org/en-US/kb/extensions-private-browsing

Dear evhenry and cor-el,

Thank you very much for your answers, they perfectly answered my question.

cor-el said

See also:

• https://support.mozilla.org/en-US/kb/extensions-private-browsing

evhenry said

You can re enable the add ons if you have history forgotten by going to the add ons and enabling them for "private windows." It appears putting firefox in "never remember history" is like a permanent private window mode. This could be clearer within the settings.