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Change Firefox filename pattern for Take Screenshots

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Firefox can take screenshots of pages or screenshots of custom areas of pages.

According to the documentation, when we download the image, the filename should follow the pattern: Screen Shot yyy-mm-dd at hh.mm.ss.png. If I use the :screenshot at the console, the pattern works as documented.

But Firefox is using a different pattern when I choose Take Screenshot from the context menu. The pattern includes the page's title. Example: Screenshot 2024-04-14 at 18-35-16 General ‹ Settings ‹ Geomaster Lda — WordPress.png.

Since the page title can have non common filename characters, I have problems with such filenames. My uploads to MediaWiki fails with such filenames. I know I can report or improve MediaWiki, but my question here is quite simple.

Can I change the Firefox's default pattern for Take Screenshot's downloads?

Firefox can take screenshots of pages or screenshots of custom areas of pages. According to the documentation, when we download the image, the filename should follow the pattern: Screen Shot yyy-mm-dd at hh.mm.ss.png. If I use the :screenshot at the console, the pattern works as documented. But Firefox is using a different pattern when I choose Take Screenshot from the context menu. The pattern includes the page's title. Example: Screenshot 2024-04-14 at 18-35-16 General ‹ Settings ‹ Geomaster Lda — WordPress.png. Since the page title can have non common filename characters, I have problems with such filenames. My uploads to MediaWiki fails with such filenames. I know I can report or improve MediaWiki, but my question here is quite simple. Can I change the Firefox's default pattern for Take Screenshot's downloads?
Bifogade skärmdumpar

Alla svar (5)

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You can look at the filename function to see how this works.

EDIT: see also this bug.

  • 1744779 - Failing to download file due to missing filename sanitation

Note that you can save the screenshot to the clipboard.

Ändrad av cor-el

Hjälpsam?

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You can modify the page title via document.title e.g. via a JavaScript bookmarklet and sanitize invalid characters. You can also set Firefox to always ask where to save the downloaded file what should allow to shorten/modify the filename.

Hjälpsam?

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Hi cor-el,

Thank you for your very useful insights.

The JavaScript bookmarklet is promising, but it does not always work. The title on the browser changes immediately, but the downloaded file still uses the old title.

I'll try to understand why this simple bookmarklet sometimes fails:

javascript: (() => { document.title = 'Untitled'; })();

I'll come back if I find a working solution.

Hjälpsam?

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If the problem is with full-page screenshots, the Save Screenshot extension lets you specify the elements to include in the file name. It has some level of sanitization for characters that are illegal in file names, but I don't know whether it addresses the characters that are giving you problems. Perhaps you could use the URL instead of the title as a workaround.

Hjälpsam?

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Spectacle would be a far better option if you're in KDE.

https://apps.kde.org/spectacle/

Hjälpsam?

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