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Broken CSS on Firefox addons page

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For some time now the Firefox addons page looks like a broken CSS. Last night it fixed itself for about 5 minutes and then went back to broken state again. I can't find an easy way to report this to Mozilla, so I'm hoping someone of their web developers would be reading this forum. There's a screenshot of what the addons page looks like in 99.99% of the time. I tried everything I could think of, including deleting history, browser cache, resetting to a clean profile, etc. - nothing changed it back to the normal view. I even tried as described at the end of this article https://support.mozilla.org/en-US/kb/websites-look-wrong-or-appear-differently to click "View" menu but it already is set to "Basic view", so that didn't help either. Installing an addon works fine, it's just that the website appears as a broken CSS. The browser version is Firefox 73.0.1 64-bit.

Edit: only the addons page appears as a broken CSS, all other pages of the domain mozilla.org appear to be fine.

Ama-screenshot ananyekiwe

Okulungisiwe ngu rado84

All Replies (3)

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The site's main stylesheet loads from a different host:

https://addons-amo.cdn.mozilla.net/amo-bc9a83c3cc6909ed12f3.css

Are you able to load the stylesheet if you follow that link directly?

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Following the link directly: "Firefox noticed a possible security threat and did not proceed to addons-amo.cdn.mozilla.net because the site required a secure connection.

addons-amo.cdn.mozilla.net uses a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only use secure connections. You cannot add an exception when you visit this page."

However, since this morning when I posted the question, I discovered something: for whatever reason Firefox doesn't delete its cache when closed (I've set FF years ago to clear cache upon closing in Settings) and since the cache capacity is hardcoded to be just 1024MB, it fills up quickly and when it does, there's no more space where to download the CSS files. So I created an alias to manually clear browser cache when it gets filled and it works. After deleting the whole cache directory for my profile the CSS loads normally.

  1. deleting firefox cache

alias ffcache="rm -r ~/.cache/mozilla/firefox/myprofile.default"

So my problem was self-solved (by me) and hopefully the above information would help someone else in my position.

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Firefox should should delete unneeded files from the disk cache to make space for new ones. If your Firefox doesn't work that way, hmm, I can't explain that.