Some add-ons installed do not show in the toolbar

I have some add-ons installed that keep disappears from the toolbar at the top of the page where I want what they (next to the search bar). They include the video Download Helper and Cookies-Self-Destructing. I entered in Customizing, and these modules do not appear in the "features and additional tools. They are permanently installed because they show in the Add-ons Manager, but they aren't in the top bar - I down the module restored Bar and several of my modules show there, but not those. There is no arrow indicating that they are actually there but hidden. They are not there. I guess that there is some kind of conflict, but I don't know what it could be. He seems to have nothing to do with this theme that I use at the same time. Thank you. use: Windows 7, Firefox 50.0.2

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There seems to be a problem with Ublock. If I uninstall it, the Add-ons reappear and I am able to put them in the toolbar. I installed Adblock Plus.

I don't have these problems on my PC which has Windows XP Pro SP3 and the current Firefox with the same type of Ublock. So I don't know what happened. Thank you!

Tags: Firefox

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