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OK, well if you want to narrow down the cause you could try returning to a non-private window and visiting wordpress.org, to confirm whether you get the security warning there. And/or you could right-click on the security warning and use Firefox’s “Inspect” feature, and look at the nearby code for URLs of external sites – your history might hold an invalid security certificate or something for one of them.
Further to the mod’s suggestion above, Firefox’s “Clear history” dialogue permits you to select what to clear; you can retain your browsing and download history, active logins, form & search history and site preferences, and just clear cookies, cache and offline website data. Clearing cookies might change the behaviour of some websites, eg. it’ll empty any shopping baskets. Clearing the cache is the most likely to clear the warning.
Also check that your system’s date and time are roughly correct.