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I got slightly different apks than @gk ones. I ran a few checks: zipcmp gk/tor-browser-10.5a3-android-x86-multi-qa.apk acat/tor-browser-10.5a3-android-x86-multi-qa.apk

-       1194 be7dcb34 META-INF/ANDROIDQ.RSA
+       1194 d6fda0f7 META-INF/ANDROIDQ.RSA
-     259467 36702dd1 META-INF/ANDROIDQ.SF
+     259467 5703faf0 META-INF/ANDROIDQ.SF
+     259424 3444b186 META-INF/MANIFEST.MF
-     259424 4668e970 META-INF/MANIFEST.MF
-    8519520 a6153309 classes.dex
+    8519520 100dcb4c classes.dex
-    2873052 501b0a28 classes2.dex
+    2873136 5be103d1 classes2.dex

diff <(apkanalyzer dex packages gk/tor-browser-10.5a3-android-x86-multi-qa.apk) <(apkanalyzer dex packages acat/tor-browser-10.5a3-android-x86-multi-qa.apk)

1c1
< P d 65410	72878	9255326	<TOTAL>
---
> P d 65411	72879	9255387	<TOTAL>
54295,54296c54295,54296
< P d 16156	16377	2086496	org
< P d 14787	14898	1893092	org.mozilla
---
> P d 16157	16378	2086557	org
> P d 14788	14899	1893153	org.mozilla
76546c76546
< P d 2263	2266	268503	org.mozilla.geckoview
---
> P d 2264	2267	268564	org.mozilla.geckoview
77242c77242
< C d 38	38	4724	org.mozilla.geckoview.GeckoResult
---
> C d 39	39	4790	org.mozilla.geckoview.GeckoResult
77261a77262
> M d 1	1	66	org.mozilla.geckoview.GeckoResult org.mozilla.geckoview.GeckoResult lambda$accept$0(org.mozilla.geckoview.GeckoResult$Consumer,java.lang.Object)
80179c80180
< C d 2	2	189	org.mozilla.geckoview.-$$Lambda$GeckoResult$I3k4K0DCRrX6z4p5VGaRoaRBTZM
---
> C d 2	2	184	org.mozilla.geckoview.-$$Lambda$GeckoResult$I3k4K0DCRrX6z4p5VGaRoaRBTZM
80181c80182
< M d 1	1	68	org.mozilla.geckoview.-$$Lambda$GeckoResult$I3k4K0DCRrX6z4p5VGaRoaRBTZM org.mozilla.geckoview.GeckoResult onValue(java.lang.Object)
---
> M d 1	1	63	org.mozilla.geckoview.-$$Lambda$GeckoResult$I3k4K0DCRrX6z4p5VGaRoaRBTZM org.mozilla.geckoview.GeckoResult onValue(java.lang.Object)

diff <(apkanalyzer dex code --class org.mozilla.geckoview.GeckoResult gk/tor-browser-10.5a3-android-x86-multi-qa.apk) <(apkanalyzer dex code --class org.mozilla.geckoview.GeckoResult acat/tor-browser-10.5a3-android-x86-multi-qa.apk)

> .method static synthetic lambda$accept$0(Lorg/mozilla/geckoview/GeckoResult$Consumer;Ljava/lang/Object;)Lorg/mozilla/geckoview/GeckoResult;
>     .registers 2
> 
>     .line 1
>     invoke-interface {p0, p1}, Lorg/mozilla/geckoview/GeckoResult$Consumer;->accept(Ljava/lang/Object;)V
> 
>     const/4 p0, 0x0
> 
>     return-object p0
> .end method
>

So, I think the only difference is that the code of org.mozilla.geckoview.GeckoResult in my apk has:

.method static synthetic lambda$accept$0(Lorg/mozilla/geckoview/GeckoResult$Consumer;Ljava/lang/Object;)Lorg/mozilla/geckoview/GeckoResult;
    .registers 2

    .line 1
    invoke-interface {p0, p1}, Lorg/mozilla/geckoview/GeckoResult$Consumer;->accept(Ljava/lang/Object;)V

    const/4 p0, 0x0

    return-object p0
.end method

.method static synthetic lambda$accept$1(Lorg/mozilla/geckoview/GeckoResult$Consumer;Ljava/lang/Throwable;)Lorg/mozilla/geckoview/GeckoResult;
    .registers 2

    .line 1
    invoke-interface {p0, p1}, Lorg/mozilla/geckoview/GeckoResult$Consumer;->accept(Ljava/lang/Object;)V

    const/4 p0, 0x0

    return-object p0
.end method

While in gk's one the accept$0 is not there (optimized out?)