My connection is not secure (to almost any HTTPS) since latest Windows 10 update
Has anyone else had similar problems and figured out how to fix it? Everything was fine a couple of hours ago, except that Firefox was getting unusually laggy. I thought a reboot might fix it, and I figured I'd let the latest Windows update install while I was rebooting anyhow. But after the reboot, the only secure pages that'll load in Firefox are the ones belonging to Mozilla.org! And even most of them don't look normal, they're coming up text-only apart from one. All my usual secure pages load fine in Edge, and I've had Kaspersky running the whole time and haven't visited any dodgy pages, so I don't think it's likely to be malware; Kaspersky updates its virus data several times a day but hasn't updated its software and asked for a reboot recently, so I don't think anything there important has changed. I tried uninstalling & reinstalling Firefox, and letting it refresh my settings, it didn't help at all. Nor did disabling all add-ons, or clearing browsing history. I'm running 64-bit Firefox if it matters (or rather I was.. might have to use Edge instead now ugh).
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The Mozilla forum site here is https site. How did you update to W10 and what do you mean laggy? The last part is subjective so there has to be some measurement to know where that is coming from.
I am using Edge to access this site. I had to copy-paste the information about Firefox over from it. I was already running Win10; I have it set to metered connection to give me more control over when updates happen; I went into Settings - Updates and told it to check for updates, and then to download the update it found.
Yes of course laggy is subjective. I can only give you subjective information on the lag, because I didn't time it, but it was significantly more laggy than usual; if I tried to highlight text on a webpage with the mouse then sometimes I had to wait a number of seconds, but never more than a minute, between issuing the mouse command and seeing the text highlight. This is unusual, it's normally virtually instantaneous. However I did have 8 or 10 tabs open at once, which I've noticed can mean there's lag in responsiveness in the visible tab while something's going on in another one.
Disable Kaspersky and see what happens. I think it's kaspersky being overly aggressive and is part of the laggy performance.
Sounded like a reasonable suggestion but when I tried it, disabling Kaspersky made no difference, Firefox still gave the same error message on the usual secure pages.