Gibberish text in some web pages in place of advert in Firefox but not other browsers
On some web pages such as Amazon and Daily Mail there are paragraphs of gibberish text which I believe appear where an advert was placed. The pages appear quite correct in Opera and Vivaldi browsers.
I have closed Adaware and uBlock and have scanned with Kaspersky, Malwarebytes and Superantispyware with no problems found.
This problem has started quite suddenly and has never happened before.
Any help would be gratefully accepted.
ps I have images of pages showing problem but they will not upload - been trying for ages!
All Replies (4)
Websites like Google and Facebook and YouTube have enabled Brotli (br) encoding for files send via a secure connection. Some (security) software intercepts a secure connection and acts like a man-in-the-middle to scan content and may not recognize this encoding and changes the content-type header to text/plain. This causes Firefox to display compressed content as gibberish instead of rendering the decompressed content. If this content is in an iframe then right-click this content and use "This Frame -> Open Frame in New Tab". You can check the issuer of the certificate to see what software is interfering with the connection and places itself as a "man-in-the-middle" between Firefox and the web server. Make sure to have the latest updates of this software and possibly contact them for support.
Hi Tried 'Open Frame in New Tab' but it is a page of gibberish with just a couple of lines at the bottom about Underscore.js.
Have uploaded two images of page in Firefox and Opera.
What code gets selected if you check this gibberish in the Inspector?
You can right-click and select "Inspect Element" to open the builtin Inspector with this element selected.
Hi
Thanks for helping. Using "Inspect Element" there is one passage selected and I have attached an image. If you try to copy it, the result is an extremely long passage of rubbish.
