References to complementary extensions

[grahamperrin]

b0495e2#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R28

https://addons.mozilla.org/addon/show-anchors-2/ is no longer available.

For what it's worth, two alternative complementary extensions are mentioned by me at https://forums.FreeBSD.org/threads/81963/post-530203

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Side note

Non-localised AMO URLs, for example https://addons.mozilla.org/addon/jump-to-anchor/, will be more useful to readers whose preferred language is not English.

[brettz9]

Thanks for the report!

[grahamperrin]

Thanks for the fix!