Stopped working at all. Sorry folks, for not updating the review.

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To me, export function does not work right now. At first, when blocking number is fewer, it worked fine... like up until 645 channels. Now I have as many as 887 blocking channels, and when I try to export the data, the jason file is split into two files, of which the first file (part 1 of 2) includes just as many as 500 channels and the second and last file (part 2 of 2) contains none (just brackets "[]"). So... where did other 387 channels go? This issue is only one minus point for this add-on.

Oh. btw, I am using 56.0.2 version of firefox.

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I was using 6.1.0 version of this add-on, when I wrote the report above.
Then I tried to downgrade to 5.2.5 and then 5.2.3 because somewhat I thought it might work.
The result is... export function works well on both 5.2.5 and 5.2.3. BUT I lost 887 - 793 = 94 channels data while this downgrade (happened when downgrading from 6.1.0 to 5.2.5).
I do not know where these 94 channels data have gone. There may be that many double channel entries in 6.1.0 version.
Most importantly, what is version 6.1.0 anyway? I cannot find it anymore! Not even release note. Strange...