Why won't adblock plus stay on the computer, even after I sent $5.oo?

Question

I used to have Firefox on my laptop and my favorite part about it was Adblock. After having work done on the computer, I reinstalled Firefox. No adblock so I reinstalled it. It stayed until the next use; I had to reinstall it each time. Now it does not even come on, even though I sent $5.00 to Firefox because I feel it is more than worth it.

Answer 1

First of all, because you wrote, in effect, that you are having trouble "even though I sent $5.00 to Firefox," I want to assure you that the folks at Firefox and at Adblock are not conspiring to do bad things to users who do not send them money, which they then suspend when you send them enough. So please send any donation because you care (you seem to) and not out of fear (as you wrote, perhaps in haste).
As for your question about Adblock Plus, one question in advance, please. At the upper right of your screen, just to the right of the search engine box, can you see the letters "ABP" inside a red stop-sign shape? This is one sign that Adblock Plus is installed. Similarly, under the Firefox menu item View, perhaps the fourth option down from the top, can you see Adblock Plus: Blockable Items"? It should be there. Also, under the Firefox menu item Tools, can you see Adbock Plus Preferences'? Finally, also under Tools, when you open Add-ons, is Adblock Plus in the list that appears?
These are clues to let us know for sure that Adblock Plus is actually installed or not, which will help others help you.