Firefox needs to be opened twice

A few days ago I noticed that Windows would boot, I'd double click on Firefox as usual, and although the egg-timer came up Firefox didn't load. I thought "maybe I hadn't double clicked". But it happens every time, and this morning I noticed that firefox.exe appears on the processes list when I do this, then it disappears. It's not causing any harm that I can tell because if I try to open Firefox a second time it works fine. What's going on here?

My sincere apologies - I'm getting old!
This is EXACTLY the same problem I had some time ago which I asked about in this community. I found the solution then and it's the same now. Adblock!
I'm sorry to have wasted anyone's time.
Hugh

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Hello,
In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see [[How do I create a screenshot of my problem?]]
Once you've done this, attach the saved screenshot file to your forum post by clicking the '''Browse...''' button below the ''Post your reply'' box. This will help us to visualize the problem.
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Firefox needs to be opened twice

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