Hi mrZZZ Sorry I am finding it difficult to understand what is being asked and what you need help with.

We only deal with questions asked using the English language here. If English is not your first language please say what languages are better for you. I may be able to point you at help in another language.

You my find google translate is a useful tool to help with asking questions in English.

It is possible that there is a problem with files in the profile folder that store the extensions registry.

Delete the extensions.* files (e.g. extensions.json, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

• https://support.mozilla.org/kb/Profiles

New files will be created when required.

See "Corrupt extension files":

• http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
• https://support.mozilla.org/kb/Unable+to+install+add-ons

If you see disabled or not compatible extensions in "3-bar Menu button/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

If this didn't help then delete Add-ons.json and possibly prefs.js in case there is a problem with preferences.

Thanks for the advice. Unfortunately, my English is poor. I speak Russian. The problem is that: without my participation in the browser regularly installed add-on "SmartBrowser", which removes addition "Adblock Plus". Do you understand my problem?

Can you remove that SmartBrowser extension or doesn't it have a remove button?

• http://kb.mozillazine.org/Uninstalling_add-ons
• http://kb.mozillazine.org/Uninstalling_toolbars

• https://support.mozilla.org/kb/disable-or-remove-add-ons
• https://support.mozilla.org/kb/uninstalling-toolbars

Note some of those links should redirect for you

• Disable or remove Add-ons =>/ru/kb/udalenie-dopolnenij <= Отключение или удаление дополнений
• Remove a toolbar that has taken over your Firefox search or home page => /ru/kb/udalit-chuzhuyu-panel-instrumentov?r... <= Удаление чужой панели инструментов заменившей ваш поиск или домашнюю страницу Firefox