Hi Chris First, I would like to thank you because I installed Netsurf on my Amiga machines and I think it's a smart application. I like to use it, it is improved at each new release and is quite fast browsing. Then, you know, I am a developer and I like quality software, including things like continuous integration, static code analyzers, ... and I have to say I am impressed by Netsurf for all what is done in this area. That's not common. About that, I like to use the compiler sanitizers that really help to find problems / bugs at execution. So I compiled Netsurf on Linux with: make CC="gcc -fsanitize=undefined,address" I have to say I did not find easily where to modify CFLAGS and if I was forced or not to modify one or several makefiles. Anyway, compiling like that provides instrumented code that checks some errors. If I run Netsurf and then I quit it, I get: content/handlers/javascript/duktape/duktape.c:52791:6: runtime error: load of misaligned address 0x61400000b7cf for type 'duk_uint32_t', which requires 4 byte alignment 0x61400000b7cf: note: pointer points here  02 00 00 00 05  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  00 00 00              ^ src/libnsbmp.c:287:43: runtime error: shift exponent 32 is too large for 32-bit type 'int' src/libnsbmp.c:569:64: runtime error: left shift of 150 by 24 places cannot be represented in type 'int' src/libnsbmp.c:71:88: runtime error: left shift of 150 by 24 places cannot be represented in type 'int' src/parse/properties/utils.c:889:15: runtime error: left shift of 255 by 24 places cannot be represented in type 'int' /home/mathias/Sources/netsurf-all-3.7/libcss/src/select/bloom.h:63:21: runtime error: left shift of 1 by 31 places cannot be represented in type 'int' ================================================================= ==22287==ERROR: LeakSanitizer: detected memory leaks Direct leak of 3145728 byte(s) in 1 object(s) allocated from:     #0 0x7fc36b8c1ed0 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.3+0xc1ed0)     #1 0x55a757175395 in read_entries content/fs_backing_store.c:1229     #2 0x55a757175395 in initialise content/fs_backing_store.c:1556     #3 0x55a75787f977 (/home/mathias/Sources/netsurf-all-3.7/netsurf/nsgtk+0x13a2977) ... SUMMARY: AddressSanitizer: 5300121 byte(s) leaked in 1958 allocation(s). Leaks could also certainly be found by valgrind (not used looking at Jenkins jobs). If I start and click on the CNN link and thenk I quit, I get (as part of the output): src/libnsbmp.c:287:43: runtime error: shift exponent 32 is too large for 32-bit type 'int' src/libnsbmp.c:569:64: runtime error: left shift of 150 by 24 places cannot be represented in type 'int' src/libnsbmp.c:71:88: runtime error: left shift of 150 by 24 places cannot be represented in type 'int' src/parse/properties/utils.c:889:15: runtime error: left shift of 255 by 24 places cannot be represented in type 'int' /home/mathias/Sources/netsurf-all-3.7/libcss/src/select/bloom.h:63:21: runtime error: left shift of 1 by 31 places cannot be represented in type 'int' src/utils/utils.c:130:18: runtime error: left shift of negative value -1 /home/mathias/Sources/netsurf-all-3.7/libcss/src/select/bloom.h:63:21: runtime error: left shift of 1 by 31 places cannot be represented in type 'int' src/parse/properties/utils.c:655:16: runtime error: left shift of 191 by 24 places cannot be represented in type 'int' src/libnsbmp.c:848:54: runtime error: left shift of 255 by 24 places cannot be represented in type 'int' render/layout.c:1343:32: runtime error: negation of -2147483648 cannot be represented in type 'int [4]'; cast to an unsigned type to negate this value to itself So maybe you (or the team) could use these useful sanitizers to help finding bugs. Let me know if you prefer me to create a ticket in the bugtracker. A last comment: looking for your email in os4depot, I've just noticed that the latest version there is 3.6. Regards, Mathias