Ghost text in PDF viewer

[HelloMoz]

Many PDF have the text overprinted to the rendering:

Seems to be especially PDF from academic publications, e.g. https://pubs.acs.org/doi/epdf/10.1021/jm100020w (open access, not paywalled)

Does only happen when PDF is opened within the website, not when downloaded and PDF opened as file within FIrefox.

Cheers,

[jscher2000]

The code websites use to render PDFs as HTML and CSS is similar to the code Firefox uses, but one notable difference is that add-ons are not allowed to inject code into Firefox's built-in PDF viewer. So one possible explanation might be an add-on that modifies styles or colors on websites. There is a transparent text layer that is aligned on top of the background image to allow Find in page and selection/copy. If I use the Page Inspector to make the transparent text visible and turn off the precise placement of the text layer (attached), then I get an appearance similar to your screenshot. Can you think of any add-ons you might have installed that could be making those changes?

[HelloMoz]

I couldn't identify an add-on causing this in Troubleshoot mode, the only add-on in question could be an ad-blocker, but that didn't change anything. However, the Firefox in question is an ESR (115.14.0esr), so probably that'll be the reason. Thanks!

[Agentvirtuel · Accepted solution]

Hello

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@HelloMoz wrote:

the Firefox in question is an ESR (115.14.0esr), so probably that'll be the reason.

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That's right
https://www.youtube.com/embed/wMgEOwsH88E

For information purposes
Firefox Release Calendar
https://whattrainisitnow.com/calendar
https://www.camp-firefox.de/artikel/891-alles-wissenswerte-zu-firefox-esr-128-inklusive-unterschiede...
https://www.mozilla.org/en-US/firefox/128.0esr/releasenotes