Perceptual hashing snippet is considerably slower on Firefox

Environment

ABP 3.6.2.

How to reproduce

1. Add this custom filter: unicum.de#$#hide-if-contains-image-hash 3f032367e1e1e17f,1f071f1c243f231f,1f071f1c143f071f,1f073d38243f231f,3f7f3f41417fff00,1f071f1c143f131f,0f1b1f0d0b1f1b1b,3f27e7e0c0e7277f,1f073d1c98b901bf,fe70f90a00ff9f81,69f0f0f0f0f0f0f0,0f0f1f0d0f0f0f0f,3c72c78600ff00ff,0fd2d2d2d2d2f2e0,ff001e0f9fc000ff,c3c3cf8189b93c1e,02fbe8e8f8e0fd01,f9090f5534376167,0fc9c99928f6f381,f017131f1f1524fc,30dd9d131f131397,95c99f09a9a90bf8,c3c3d2e2e3c287c3,fe8044eef0e1f138,0f0f435b5f3056e2,f87066666267270f,b30706bef01e1ec3,a783033f3c721ef0,03e7670747636707,767670747276707,00ff878b3f30bb30,c783d1e1e1f0cf81,fc03703e00ff427e,163ee41e9eb07878,03ebe323c3c327c3,85f1d85cda137f20,8787c7c107c707c7,b8b8d89c98f87878,7e18813f9fc000ff,103f073737073f0a,00ff3e0e4e4e7f01,00ff38797b30ff00,00ffc41fc7d0ff00,7e18df80664d0e76,fe80c0ddc3c3c7e0,3c277f2080fb00ff,b8b4b998e8d27f10,1d5999b1f1e000ff,1e7888cf0737c3c3,cf0c9e0e782ec3c3,61f8d8d8191f86f4,ff0000fff36000ff,0f0f0f0f0f0f0f0f,7c64f4e0607dff00,d7038b8785f87e18,ff001cf1e0f181bd,ff00825f1e72ff00,e585eab0f0a9a6e1,89abaaaaaaaaaf81,80fbe0e6c0dbeb81,04f7e3c283b9dd81,c3c3071fff007e18,bf80fb80ff0000ff,f505ef08730e20df,3f051f07077cff00,815f00ff427e7e62,0f0f071f1c3e287e,f01ddc38b0b634f4,163e3c3c01fbeb81,3c78e03700ff00ff,85ada5b4e7818799,54f8f0f0f0f0f870,ff00fb0100ffff00,97c8c0fc8bc3c3a5,e3c1e199c0e7c3a5,b8e444fc58f8de50,d1f073c1823f187e,fc0534f123f8f903,f981e43c03f6be05,d0b5987c3e0bc0f6,d71888fc303f1e36,00fffe100d37ff00,81bdfe80c3873f81,f0d8307e62e6a6f0,e8e4d4a5e619e6e0,58f8c55cf107ff00,487ea5878787057e,d0d9d8d8d8d8f1d0,e0cdc5c5cdc1cdc8,24e700ff7f01ff00,878d05f5d585f838,dd03873cc6723cc3,f948f0f0f0f080fe,a78383bc3e833e1c,f0f0f0f0f0f0c7c2,0e76827ee0f1ff00,c3e83c3cfc06acc6,ff002cce80bfdb81,00ff9b8383e37e30,ff007c911f38e81d,00ffeb81cf0cc0f5,ef81f780819fe349,3f032373e1e1e17f,fb80c3c37e22fd08,3c7870e37cb0dd81,ee84f8e000ff9f81,b8b4b9a800ff80ef,e781147eff00ff00,1c9e9e1c3cd8dae0,e0e3078f017fff00,ff002f0d1739ff00,18db483fdb1204fe,431f17171f2c327a,bf041fc400ffeb81,21fc9f6001fb427e,3e1a207f5693847e,7e1870b91ce3ff00,ef0800ff427e7e22,fc3000ff00ff427e,fe60ed81ff00ff00,3f236363e1e1e17f,145f797060f939f0,43e3c70eef023c1e,c4e3c2f470f8d1f0,207f073737077f10,8f8381ffe0f1ff00,93930f1e00fff381,ffc0e1e1c1e3ff00,3c3c328f00fff1b0,3c3c328fce921e4e,f0d8cc1b00fff381,783c3c3c30f9f0f0,7b033f8200ff81db
2. Go to https://unicum.de ...

Observed behavior

In Firefox the page loads much slower than without the filter.

Expected behavior

There should be no impact on page loading speed by the filter.