Version 2.3.6 has been upgraded to work with FF 72 and later.
(You may notice that the toolbar icon has grown larger. Mozilla is getting fussier about the icons).

Important bug fixes for background estimation.

The behaviour of the Blacken and Whiten commands has been altered to
disregard the background. This makes them more useful as manual overrides
of text colour.

This adds some more tuning parameters. The speed on complicated
pages has also been increased.

Some web sites, e.g. the Washington Post, generate large numbers of apparent changes to the page, up to several hundred per second. (I suspect a Google script is to blame). This overloaded the Blacken add-on which clogged Firefox. This was most apparent on Windows. This version copes better with the problem.

Also there is a fix that makes the whitelists work again.

This has been updated for version 62 of firefox. It only has minimal fixes.

This is the first Web Extensions version. You must have first upgraded to 2.2.33 in order to preserve your settings.

Most things still work as well as before. However control over the grayness of placeholder text has been lost. You can still change it manually.