what does fw mean

Error: Message: unknown error: net::ERR_PROXY_CONNECTION_FAILED (Session info: chrome=135.0.7049.114) Stacktrace: #0 0x55c6caa0775a #1 0x55c6ca4ba4b0 #2 0x55c6ca4b1593 #3 0x55c6ca4a1c69 #4 0x55c6ca4a396d #5 0x55c6ca4a1ffe #6 0x55c6ca4a199e #7 0x55c6ca4a164f #8 0x55c6ca49f4cf #9 0x55c6ca49fc8a #10 0x55c6ca4bd949 #11 0x55c6ca5581f5 #12 0x55c6ca531592 #13 0x55c6ca5575e0 #14 0x55c6ca531363 #15 0x55c6ca4fdd63 #16 0x55c6ca4fe9c1 #17 0x55c6ca9cca6b #18 0x55c6ca9d0951 #19 0x55c6ca9b4b62 #20 0x55c6ca9d14c4 #21 0x55c6ca99913f #22 0x55c6ca9f56f8 #23 0x55c6ca9f58d6 #24 0x55c6caa065a6 #25 0x7f1d0671bac3