I am looking for a Google Chrome extension that can block meme pictures.
It should work with Windows 7, if OS-dependent. Gratis is better.
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The difficulty with a meme blocker is that it's hard to identify which images are memes and which are non-meme kitten pictures. Probably your best bet is to use a text-only browser mode. On Chrome, Text Mode seems a good choice:
In my test, it does block those images on the blog post. It doesn't put a red X over them, but it does allow several options for replacing images:
Unfortunately, as I alluded to, it doesn't target memes, but all sorts of images including the site logo, the author avatar, and other potentially informative images. But on the internet, nearly any image is a potential meme so think of this as future-proofing.
The extension toggles the text-only mode for new page loads. It does not re-render pages loaded with images. It also does not reflow text, but leaves the textblock shaped as if the image still existed. Fortunately, this extension does work with Readability to produce a pleasing page sans images.